Malicious PDF — malware analysis report

Static analysis result for SHA-256 39400107ce62146f…

MALICIOUS

PDF

1.89 MB Created: 2007-06-06 18:37:36 -04:00 Authoring application: AcroForm (via Adobe LiveCycle Designer ES 8.2) First seen: 2026-05-11
MD5: eb65ef823db4c0c32a1738a4b4613d23 SHA-1: bc59ee618d449abd3dd13d8e7de1a3295cd18148 SHA-256: 39400107ce62146f1470b9e4340b19a611a87a4b74f4c85c6b1b229586e61c68
142 Risk Score

🔏 Digital signature Modified after signing

A signature covers the whole signed byte range — PDF JavaScript is never signed on its own — and does not by itself mean the document is safe.

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains heuristics indicating JavaScript actions and embedded files, along with a strong indicator for an advance-fee scam lure. The document body is heavily obfuscated and truncated, preventing a detailed analysis of its content. However, the presence of embedded files, particularly 'embedded_file_obj4044.bin', suggests it may be used to deliver a secondary payload. The advance-fee scam lure is a common social engineering tactic to trick users into interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6126

Heuristics 11

  • Active content added after the PDF was signed medium PDF_SIGNATURE_POST_SIGN_MODIFICATION
    An incremental update appended AFTER the signed byte range introduces active content (/EmbeddedFile). Some of this can occur in legitimate form-fill (field scripts, a rewritten /Catalog), so it is suspicious rather than damning — but it is content the signer did not approve.
  • Unusually high stream count medium PDF_MANY_STREAMS
    PDF contains 501+ stream objects — may indicate heap spray or heavy obfuscation
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xfa/promoted-desc/Referenced by PDF JavaScript
    • http://www.apple.com/DTDs/PropertyList-1.0.dtdIn PDF document text
    • http://ns.adobe.com/iX/1.0/In PDF document text
    • http://cgi.adobe.com/special/acrobat/updateReferenced by PDF JavaScript
    • http://ns.adobe.com/xdp/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xci/1.0/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-template/2.5/Referenced by PDF JavaScript
    • http://www.w3.org/1999/xhtmlReferenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-data/1.0/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-locale-set/2.1/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-connection-set/2.1/Referenced by PDF JavaScript
    • http://www.ibm.comReferenced by PDF JavaScript
    • http://www.w3.org/2001/XMLSchema-instanceReferenced by PDF JavaScript
    • http://ns.adobe.com/data-description/Referenced by PDF JavaScript
    • https://dev.eapp.metlife.com/eApp/ESignServletReferenced by PDF JavaScript
    • https://int.eapp.metlife.com/eApp/ESignServletReferenced by PDF JavaScript
    • https://qa.eapp.metlife.com/eApp/ESignServletReferenced by PDF JavaScript
    • https://eapp.metlife.com/eApp/ESignServletReferenced by PDF JavaScript
    • https://dev.eapp.metlife.com/eApp/ESubmitServletReferenced by PDF JavaScript
    • https://int.eapp.metlife.com/eApp/ESubmitServletReferenced by PDF JavaScript
    • https://qa.eapp.metlife.com/eApp/ESubmitServletReferenced by PDF JavaScript
    • https://eapp.metlife.com/eApp/ESubmitServletReferenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-template/2.2/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-form/2.8/Referenced by PDF JavaScript
    • http://ns.adobe.com/xfdf/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 23

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj4042.bin pdf-embedded-file PDF EmbeddedFile object 4042 at offset 0x81BE1 163 bytes
SHA-256: 57a7e2da6826b03458ff8329edc3e4b4a4ee25ffc0b36b53e72269ebbf6c5e89
embedded_file_obj4043.bin pdf-embedded-file PDF EmbeddedFile object 4043 at offset 0x81CD5 7499 bytes
SHA-256: a162c8f4b87db87462f946c207488e304d4131638335bde632e2125b8681af11
embedded_file_obj4044.bin pdf-embedded-file PDF EmbeddedFile object 4044 at offset 0x825EA 3011551 bytes
SHA-256: 504707126fd89284111d1a379f8e3f101aa0a3277451603ec0a38082814dd825
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 71 eval/decoder/string-building token(s). 1475 of 2966 identifiers look randomly generated (e.g. 'anZ3eHl6hYaHiImKlJWWl5iZmqSlpqeoqaq0tba3'); 27 string-concatenation chain(s) — consistent with name-mangling obfuscation.
embedded_file_obj4045.bin pdf-embedded-file PDF EmbeddedFile object 4045 at offset 0xFD512 2423 bytes
SHA-256: 2d58413fda1ff20c994606823bf49e41194612c0137b6315e50fa7bdc01f1e09
embedded_file_obj4046.bin pdf-embedded-file PDF EmbeddedFile object 4046 at offset 0xFD7F5 326 bytes
SHA-256: d0b288445419710536fed2241d6371637c7788f18b5e828324f6ab06c4b7bfb2
embedded_file_obj4047.bin pdf-embedded-file PDF EmbeddedFile object 4047 at offset 0xFD90D 120096 bytes
SHA-256: 2a2eec10e17d6d6442e40039b4ff997d990fa108e585901f0caab31db40cf5c6
embedded_file_obj4048.bin pdf-embedded-file PDF EmbeddedFile object 4048 at offset 0x100824 2959 bytes
SHA-256: c062e331781932a92702eb08aca653b67e6433f74f4404c34d0be5497a167325
embedded_file_obj4049.bin pdf-embedded-file PDF EmbeddedFile object 4049 at offset 0x100BEB 85 bytes
SHA-256: af05f8185c725a70291567ae2112fa9a98b368528a7cc440552f0c0847d95121
embedded_file_obj4050.bin pdf-embedded-file PDF EmbeddedFile object 4050 at offset 0x100C9B 36104 bytes
SHA-256: 2330c1b851afed87eb4798e187604ebd3aabca933aefe2cf0af92358677d1df6
embedded_file_obj4906.bin pdf-embedded-file PDF EmbeddedFile object 4906 at offset 0x1843D6 162 bytes
SHA-256: 6a0974b6a6882b5dc1c6bc04f0f3a5682390100376bbc598a39b4cc40f33edc2
embedded_file_obj4907.bin pdf-embedded-file PDF EmbeddedFile object 4907 at offset 0x1844CB 123358 bytes
SHA-256: c200fab6d2637aab177da3f8250995b9f45547edbb328f98c54acea435b7042d
embedded_file_obj4908.bin pdf-embedded-file PDF EmbeddedFile object 4908 at offset 0x1878BF 91976 bytes
SHA-256: d730141af2dfed60223df97020f957cb51988cd6db1081b372662d6ff4916e5d
embedded_file_obj4966.bin pdf-embedded-file PDF EmbeddedFile object 4966 at offset 0x1A153B 122849 bytes
SHA-256: 08e003764df758b2777469e830741796d61c682ff51aab5c48b9cfd6327dcfa1
embedded_file_obj4967.bin pdf-embedded-file PDF EmbeddedFile object 4967 at offset 0x1A491D 91844 bytes
SHA-256: 37831316087f6d80d36fc450b590c19793ce29da8e733b4d6d509faacc91b530
embedded_file_obj5020.bin pdf-embedded-file PDF EmbeddedFile object 5020 at offset 0x1B66BD 122278 bytes
SHA-256: e349078141aab3b15896b7a3fb32872d39dc2ba16b5573a3ce362c53b529aa22
embedded_file_obj5021.bin pdf-embedded-file PDF EmbeddedFile object 5021 at offset 0x1B9A2A 91660 bytes
SHA-256: 1274436b111efee7137bf55d488d6663da8f48ab54e8490f23675e42f665d0bc
embedded_file_obj5069.bin pdf-embedded-file PDF EmbeddedFile object 5069 at offset 0x1CA5D0 122013 bytes
SHA-256: b6014e4fc786af7bce70f85c756f3c3a2ce1a24605766c44e112dc4d63d7c6a2
embedded_file_obj5070.bin pdf-embedded-file PDF EmbeddedFile object 5070 at offset 0x1CD90D 91584 bytes
SHA-256: 4451cb2043cc0e158c2fe143cc34d3ca6ea44b8eeef24e24bf7daad70e0f722a
embedded_file_obj5110.bin pdf-embedded-file PDF EmbeddedFile object 5110 at offset 0x1DB856 123188 bytes
SHA-256: 9fc9194a7127b59795670c696ac2b862621900ee3aa5bb8f693511803ede4026
embedded_file_obj5111.bin pdf-embedded-file PDF EmbeddedFile object 5111 at offset 0x1DEC93 91459 bytes
SHA-256: c1e576a720efb4db9d705a62489379364e6c7e59390c9330bd7b9b98a0fd41f0
javascript_obj4039_000.js pdf-javascript-stream PDF /JS object 4039 at offset 0x8158E 1367 bytes
SHA-256: f8721569904600df33f536ddc9f4942717077f9d6c3c4253a8f4de5650fc6531
Preview script
First 1,000 lines of the extracted script
if (typeof(xfa_installed) == "undefined" || typeof(xfa_version) == "undefined" || xfa_version < 2.5)
{
   if (app.viewerType == "Reader")
   {
      if (ADBE.Reader_Value_Asked != true)
      {
         if (app.viewerVersion < 8.0)
         {
            if (app.alert(ADBE.Reader_string_Need_New_Version_Msg, 1, 1) == 1)
               this.getURL(ADBE.Reader_Value_New_Version_URL + ADBE.SYSINFO, false);
            ADBE.Reader_Value_Asked = true;
         }
         else if (app.alert(ADBE.Viewer_Form_string_Viewer, 1, 1) == 1)
            app.findComponent({cType:"Plugin", cName:"XFA", cDesc: ADBE.Viewer_string_Update_Desc});
      }
   }
   else
   {
      if (ADBE.Viewer_Value_Asked != true)
      {
         if (app.viewerVersion < 7.0)
            app.response({cQuestion: ADBE.Viewer_Form_string_Viewer_Older, cDefault: ADBE.Viewer_Value_New_Version_URL + ADBE.SYSINFO, cTitle: ADBE.Viewer_string_Title});
		   else if (app.viewerVersion < 8.0)
         {
            if (app.alert(ADBE.Viewer_Form_string_Viewer, 1, 1) == 1)
               app.launchURL(ADBE.Viewer_Value_New_Version_URL + ADBE.SYSINFO, true);
         }
         else if (app.alert(ADBE.Viewer_Form_string_Viewer, 1, 1) == 1)
            app.findComponent({cType:"Plugin", cName:"XFA", cDesc: ADBE.Viewer_string_Update_Desc});
         ADBE.Viewer_Value_Asked = true;
      }
   }
}
javascript_obj4040_001.js pdf-javascript-stream PDF /JS object 4040 at offset 0x81775 902 bytes
SHA-256: 91ea259764c68d27b8981a339c02d8ea92224ae5c0d0cd0a7c8f3d645d599090
Preview script
First 1,000 lines of the extracted script
if (typeof(ADBE.Reader_Value_Asked) == "undefined")
   ADBE.Reader_Value_Asked = false;
if (typeof(ADBE.Viewer_Value_Asked) == "undefined")
   ADBE.Viewer_Value_Asked = false;
if (typeof(ADBE.Reader_Need_Version) == "undefined" || ADBE.Reader_Need_Version < 8.0)
{
   ADBE.Reader_Need_Version = 8.0;
   ADBE.Reader_Value_New_Version_URL = "http://cgi.adobe.com/special/acrobat/update";
   ADBE.SYSINFO = "?p=" + app.platform + "&v=" + app.viewerVersion + "&l=" + app.language + "&c=" + app.viewerType + "&r=" + ADBE.Reader_Need_Version;
}
if (typeof(ADBE.Viewer_Need_Version) == "undefined" || ADBE.Viewer_Need_Version < 8.0)
{
   ADBE.Viewer_Need_Version = 8.0;
   ADBE.Viewer_Value_New_Version_URL = "http://cgi.adobe.com/special/acrobat/update";
   ADBE.SYSINFO = "?p=" + app.platform + "&v=" + app.viewerVersion + "&l=" + app.language + "&c=" + app.viewerType + "&r=" + ADBE.Viewer_Need_Version;
}
javascript_obj4041_002.js pdf-javascript-stream PDF /JS object 4041 at offset 0x818D0 2795 bytes
SHA-256: 826c5622c798d67e5281cca7e05933dddc90ccdcb0a6177c9f7d06f11bef8f7f
Preview script
First 1,000 lines of the extracted script
if (typeof(this.ADBE) == "undefined")
   this.ADBE = new Object();
ADBE.LANGUAGE = "ENU";
ADBE.Viewer_string_Title = "Adobe Acrobat";
ADBE.Viewer_string_Update_Desc = "Adobe Interactive Forms Update";
ADBE.Viewer_string_Update_Reader_Desc = "Adobe Reader 7.0.5";
ADBE.Reader_string_Need_New_Version_Msg = "This PDF file requires a newer version of Adobe Reader. Press OK to download the latest version or see your system administrator.";
ADBE.Viewer_Form_string_Reader_601 = "This PDF form requires a newer version of Adobe Reader. Although the form may appear to work properly, some elements may function improperly or may not appear at all. Press OK to initiate an online update or see your system administrator.";
ADBE.Viewer_Form_string_Reader_Older = "This PDF form requires a newer version of Adobe Reader. Although the form may appear to work properly, some elements may function improperly or may not appear at all. Press OK for online download information or see your system administrator.";
ADBE.Viewer_Form_string_Viewer_601 = "This PDF form requires a newer version of Adobe Acrobat. Although the form may appear to work properly, some elements may function improperly or may not appear at all. Press OK to initiate an online update or see your system administrator.";
ADBE.Viewer_Form_string_Viewer_60 = "This PDF form requires a newer version of Adobe Acrobat. Although the form may appear to work properly, some elements may function improperly or may not appear at all. For more information please copy the following URL (CTRL+C on Win, Command-C on Mac) and paste into your browser or see your system administrator.";
ADBE.Viewer_Form_string_Viewer_Older = "This PDF requires a newer version of Acrobat. Copy this URL and paste into your browser or see your sys admin.";
ADBE.Viewer_Form_string_Reader_5x = "This PDF form requires a newer version of Adobe Reader. Without a newer version, the form may be displayed, but it might not work properly. Some form elements might not be visible at all. If an internet connection is available, clicking OK will open your browser to a web page where you can obtain the latest version.";
ADBE.Viewer_Form_string_Reader_6_7x = "This PDF form requires a newer version of Adobe Reader. Without a newer version, the form may be displayed, but it might not work properly. Some form elements might not be visible at all. If an internet connection is available, clicking OK will download and install the latest version.";
ADBE.Viewer_Form_string_Viewer = "This PDF form requires a newer version of Adobe Acrobat. Without a newer version, the form may be displayed, but it might not work properly. Some form elements might not be visible at all. If an internet connection is available, clicking OK will download and install the latest version.";

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