Malicious PDF — malware analysis report

Static analysis result for SHA-256 95de4ff5d36d184b…

MALICIOUS

PDF

36.4 KB Created: 2007-10-17 15:55:35 -07:00 Authoring application: Acrobat PDFMaker 8.1 for Word (via Acrobat Distiller 8.1.0 (Windows)) First seen: 2026-05-08
MD5: 61d4a22d0995e5ffac62bc713d028392 SHA-1: 4ba58aea2be84ff3fcb023fd06cbf3315a85c798 SHA-256: 95de4ff5d36d184b02c0691163b8fbea254210e918ca275adb16c1ad9a0248e1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

This PDF file exhibits multiple heuristic firings related to embedded JavaScript and embedded file payloads. The presence of several large JavaScript streams suggests an attempt to execute malicious code. The primary intent appears to be downloading and executing a second-stage payload, as indicated by the embedded script content. Due to the obfuscation and the nature of the embedded scripts, the exact payload and delivery mechanism are not fully discernible, leading to a moderate confidence score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9580

Heuristics 8

  • 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
  • Embedded script payload in PDF stream info PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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# In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/pdfx/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://purl.org/dc/elements/1.1/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.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-form/2.6/Referenced by PDF JavaScript
    • http://www.iec.chIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x637E 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0016.bin pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x7460 103 bytes
SHA-256: edfcc2df45ea942d3a7d5735e3b0c50156009c13b42ae49ccc4fc25949bc0afa
javascript_obj0087_000.js pdf-javascript-stream PDF /JS object 87 at offset 0xA03 1604 bytes
SHA-256: f979542c4992f256c12537db5bbe5f86605da11ef877e634ccfc2c47c9284b10
Preview script
First 1,000 lines of the extracted script
if (typeof(xfa_installed) == "undefined" || typeof(xfa_version) == "undefined" || xfa_version < 1.2)
{
   if (app.viewerType == "Reader")
   {
      if (ADBE.Reader_Value_Asked != true)
      {
         if (app.viewerVersion < 6.01)
         {
            if (app.alert(ADBE.Viewer_Form_string_Reader_Older, 1, 1) == 1)
               this.getURL(ADBE.Reader_Value_New_Version_URL + ADBE.SYSINFO, false);
         }
         else
         {
            if (app.alert(ADBE.Viewer_Form_string_Reader_601, 1, 1) == 1)
               app.findComponent({cType:"Plugin", cName:"XFA",
                                   cDesc: ADBE.Viewer_string_Update_Reader_Desc});
         }
         ADBE.Reader_Value_Asked = true;
      }
   }
   else
   {
      if (ADBE.Viewer_Value_Asked != true)
      {
         if (app.viewerVersion == 6)
         {
            app.response({cQuestion: ADBE.Viewer_Form_string_Viewer_60,
            cDefault: ADBE.Viewer_Value_New_Version_URL + ADBE.SYSINFO,
            cTitle: ADBE.Viewer_string_Title});
         }
         else if (app.viewerVersion < 6)
         {
            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.alert(ADBE.Viewer_Form_string_Viewer_601, 1, 1) == 1)
                app.findComponent({cType:"Plugin", cName:"XFA",
                                   cDesc: ADBE.Viewer_string_Update_Desc});
         }
         ADBE.Viewer_Value_Asked = true;
      }
   }
}
javascript_obj0088_001.js pdf-javascript-stream PDF /JS object 88 at offset 0xBEB 902 bytes
SHA-256: 3bf84668674e23c91aaaa6c58c24a1f80a30566e9cfbd09040882d18101fed76
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 < 6.01)
{
   ADBE.Reader_Need_Version = 6.03
   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 + "&w=" + "XFA1_5";
}
if (typeof(ADBE.Viewer_Need_Version) == "undefined" || ADBE.Viewer_Need_Version < 6.01)
{
   ADBE.Viewer_Need_Version = 6.03;
   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 + "&w=" + "XFA1_5";
}
javascript_obj0089_002.js pdf-javascript-stream PDF /JS object 89 at offset 0xD55 2798 bytes
SHA-256: 922f7942d25f53e6e6eedc1b3a95c47a757faab3be4838fa02db0dbea2c4dbcc
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_7x = "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.";
stream_011_off0000641d.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x641D 3099 bytes
SHA-256: 3688b2da099753e47d6507fba45f8c48923008b6f289c962ff9f23ec28d83250
stream_012_off00006874.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6874 3421 bytes
SHA-256: cb800402ae015a094d44ed1f3a99882c4f638662944d5f5c41498e336407a79d
stream_013_off00006c2f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6C2F 365 bytes
SHA-256: f963102064bf900d57980c3d8b038784ae562f0d3c7c9f64f95b59735168b99d
stream_014_off00006d22.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6D22 2423 bytes
SHA-256: 2d58413fda1ff20c994606823bf49e41194612c0137b6315e50fa7bdc01f1e09
icc_00_off00003706.icc pdf-icc-profile PDF ICC profile at offset 0x3706 3144 bytes
SHA-256: 2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e

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