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
MD5: 677ee7aff3a63c3103922fef8af22f04 SHA-1: aae92c1a2dc7ae04b2dc255c84161135dcb2f5bc SHA-256: f9b3dfcbeb01472aa91a45543503454683588e28ccc35c3c5e9be18c3201892b
230 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.

Heuristics 12

  • ClamAV: Pdf.Exploit.Agent-35646 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35646
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Secondary embedded PDF body has suspicious static findings high 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.
  • 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
  • JavaScript action low 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
  • 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
  • Suspicious extracted artifact info 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 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#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0025_000.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 pdf-javascript-stream PDF /JS object 25 at offset 0x6D72 870 bytes
javascript_obj0027_001.js
4e139c8b22ec16bd5aa51575c80dec2bbf89b76977a06b68473031a0eb206366		 pdf-javascript-stream PDF /JS object 27 at offset 0x6EF6 2794 bytes
javascript_obj0029_002.js
c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a		 pdf-javascript-stream PDF /JS object 29 at offset 0x71E5 1528 bytes
stream_010_off0000759b.js
c3e1960ce8b7916804612ba3ca5a7383bd8329a68775ea4b0663e450b46fc6c3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x759B 1675 bytes
stream_011_off0000a0a5.bin
ed762fbdece2f28698a9b616738dad71743a6f16ae241aac314fe0a6ffbde9b6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA0A5 11668 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
stream_012_off0000a2be.bin
9de85e34edf3e917e689a8038021a103f1a74681300a3e2b9c5fc0f1e5334c45		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA2BE 2228 bytes
font_00_cff_off00001217.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x1217 31178 bytes
polyglot_child_pdf_off00036ada.pdf
b978ead48b93d9c1936f6211a724430a84f5617fd33f11c1ee4ef00fad51ae21		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x36ADA 9993 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35646
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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