Malicious PDF — malware analysis report

Static analysis result for SHA-256 56449ba5f6c94bc3…

MALICIOUS

PDF

236.6 KB Created: 2008-05-21 16:10:52 +08:00 Authoring application: Acrobat PDFMaker 6.0 for Word (via Acrobat Distiller 6.0 (Windows))
MD5: 3311936e9ea8cabb4c2877b2136425ac SHA-1: e2c808e597cffdf6c4b6d714a321bf06201a9a4b SHA-256: 56449ba5f6c94bc39f0d1dbcfed52bfde4f113cf32c3b9d6fe4581490f4792df
288 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with critical findings for CVE-2007-5659 and embedded JavaScript. The embedded JavaScript, particularly the unescape() call and the use of Collab.collectEmailInfo, strongly suggests an exploit attempt. The presence of a secondary embedded PDF further indicates a multi-stage attack. The primary intent appears to be exploiting a known vulnerability to execute arbitrary code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 11

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (matched in decompressed stream)
  • 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.
  • ClamAV: Pdf.Exploit.Agent-35908 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35908
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PermissionError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0026_000.js
afcec710789160d07f5a348e6180abd67058a5d7777b0b776126d991ba37c196		 pdf-javascript-stream PDF /JS object 26 at offset 0xA9E 1152 bytes
javascript_obj0026_001.js
daa30e3bb075b650c7e10ec3bd2a26302bb701ac90ceba112d5c347128f520ca		 pdf-javascript-stream PDF /JS object 26 at offset 0xAD5 3308 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 17 eval/decoder/string-building token(s).
polyglot_child_pdf_off0003305d.pdf
e11067346ef57183d275c56c6a63339264540313d2c07e100480dad4d2c102a4		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3305D 33263 bytes

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