Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b3dfcbeb01472a…

MALICIOUS

PDF

228.5 KB Created: 2010-04-23 16:54:43 +08:00 Authoring application: Adobe Designer 7.0 First seen: 2026-05-10
MD5: 677ee7aff3a63c3103922fef8af22f04 SHA-1: aae92c1a2dc7ae04b2dc255c84161135dcb2f5bc SHA-256: f9b3dfcbeb01472aa91a45543503454683588e28ccc35c3c5e9be18c3201892b
502 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV with the signature Pdf.Exploit.Agent-35646. Static analysis revealed multiple JavaScript streams and embedded files, including a secondary PDF with suspicious findings. These elements strongly indicate the PDF is designed to exploit vulnerabilities and download/execute a further stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9836

Heuristics 16

  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after nested-decoder de-obfuscation)
  • Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH
    A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Obfuscated multi-stage PDF JavaScript heap-spray exploit critical CVE related PDF_JS_OBFUSCATED_MULTISTAGE_HEAPSPRAY
    PDF JavaScript hidden behind nested stream filters and/or a custom in-JS decoder (rolling-XOR stager) decodes to a heap-spray / ROP chain. The spray is only visible after unwinding those layers, which is why the raw heap-spray rules miss it. This is an obfuscated multi-stage Adobe Reader JavaScript exploit; the dropped Windows payload (often named Win.Trojan.Agent by signature AV) is the second stage, not the delivery mechanism.
  • 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.
  • ClamAV: Pdf.Exploit.Agent-35646 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35646
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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.
  • 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
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • 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# 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://ns.adobe.com/pdf/1.3/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/2.1/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-template/2.2/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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0025_000.js pdf-javascript-stream PDF /JS object 25 at offset 0x6D72 870 bytes
SHA-256: 4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb
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 < 7.0)
{
   ADBE.Reader_Need_Version = 7.0;
   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 + "&w=" + "XFA1_6";
}
if (typeof(ADBE.Viewer_Need_Version) == "undefined" || ADBE.Viewer_Need_Version < 7.0)
{
   ADBE.Viewer_Need_Version = 7.0;
   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 + "&w=" + "XFA1_6";
}
javascript_obj0027_001.js pdf-javascript-stream PDF /JS object 27 at offset 0x6EF6 2794 bytes
SHA-256: 4e139c8b22ec16bd5aa51575c80dec2bbf89b76977a06b68473031a0eb206366
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";
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.";
javascript_obj0029_002.js pdf-javascript-stream PDF /JS object 29 at offset 0x71E5 1528 bytes
SHA-256: c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a
Preview script
First 1,000 lines of the extracted script
if (typeof(xfa_installed) == "undefined" || typeof(xfa_version) == "undefined" || xfa_version < 2.0)
{
   if (app.viewerType == "Reader")
   {
      if (ADBE.Reader_Value_Asked != true)
      {
         if (app.viewerVersion < 6.0)
         {
            if (app.alert(ADBE.Viewer_Form_string_Reader_5x, 1, 1) == 1)
               this.getURL(ADBE.Reader_Value_New_Version_URL + ADBE.SYSINFO, false);
            ADBE.Reader_Value_Asked = true;
         }
         else if (app.viewerVersion < 7.0)
         {
            if (app.alert(ADBE.Viewer_Form_string_Reader_601, 1, 1) == 1)
               app.findComponent({cType:"App", cName:"Reader7", cDesc: ADBE.Viewer_string_Update_Reader_Desc});
            ADBE.Reader_Value_Asked = true;
         }
         else
         {
            if (app.alert(ADBE.Viewer_Form_string_Reader_6_7x, 1, 1) == 1)
               app.findComponent({cType:"Plugin", cName:"XFA", cDesc: ADBE.Viewer_string_Update_Desc});
            ADBE.Reader_Value_Asked = true;
         }
      }
   }
   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.alert(ADBE.Viewer_Form_string_Viewer_7x, 1, 1) == 1)
            app.findComponent({cType:"Plugin", cName:"XFA", cDesc: ADBE.Viewer_string_Update_Desc});
         ADBE.Viewer_Value_Asked = true;
      }
   }
}
xfa_image_rawvalue_000.tif pdf-xfa-image-tiff XFA image/rawValue TIFF payload near offset 0xA105 8642 bytes
SHA-256: 64e6ffda976c2a87e23682a968f3b2a6cf0ca64d7908c51a46f182153a5ab8c2
Detection
ClamAV: Win.Exploit.CVE_2010_0188-7
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: NOP sled
stream_010_off0000759b.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x759B 1675 bytes
SHA-256: c3e1960ce8b7916804612ba3ca5a7383bd8329a68775ea4b0663e450b46fc6c3
stream_011_off0000a0a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA0A5 11668 bytes
SHA-256: ed762fbdece2f28698a9b616738dad71743a6f16ae241aac314fe0a6ffbde9b6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
stream_012_off0000a2be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA2BE 2228 bytes
SHA-256: 9de85e34edf3e917e689a8038021a103f1a74681300a3e2b9c5fc0f1e5334c45
font_00_cff_off00001217.bin pdf-font-stream PDF embedded font (cff) at offset 0x1217 31178 bytes
SHA-256: 23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0
polyglot_child_pdf_off00036ada.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x36ADA 9993 bytes
SHA-256: b978ead48b93d9c1936f6211a724430a84f5617fd33f11c1ee4ef00fad51ae21
Detection
ClamAV: Pdf.Exploit.Agent-35646
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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