Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3df66629bcc032b…

MALICIOUS

PDF

338.7 KB Created: 2008-03-20 15:51:33 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.1.0)
MD5: 9fb839ddba90d60c1698b272885f2ca7 SHA-1: 435dd8989207649aaec713239a031b311ac6110b SHA-256: d3df66629bcc032bdf55798b5f2aef0dec399fb0853d9a4614a70db70abc85f8
220 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains embedded JavaScript that utilizes the `unescape()` function and exploits the CVE-2007-5659 vulnerability via `Collab.collectEmailInfo`. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, as indicated by the 'Win.Trojan.Dropper-82' ClamAV detection. The presence of JavaScript actions and streams strongly suggests an exploit attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 9

  • 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)
  • ClamAV: Win.Trojan.Dropper-82 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Dropper-82
  • 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
  • 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/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0032_000.js
58b654326c3fbb53baf38fc48e979ee8d32a824d8b6b6cf91f0658dfdb45ebf0		 pdf-javascript-stream PDF /JS object 32 at offset 0x7DD 4622 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).

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