Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc56d60097480e5…

MALICIOUS

PDF

173.5 KB Created: 2009-05-15 14:55:43 +08:00
MD5: d109f2ed95eac8735bd8060d93dfb270 SHA-1: 913b3e9651bdf655694440906cafa3e49fae4de9 SHA-256: bcc56d60097480e560a72cd7ebd0f07ab1650ed376da44163c6ab3534c23ef83
256 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript with eval() and unescape() calls, indicating obfuscated code execution. ClamAV signatures confirm this is a known PDF exploit, likely Pdf.Exploit.Agent-35646. The embedded JavaScript is designed to download and execute a secondary payload, which is a common technique for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8800

Heuristics 9

  • 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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00000675.js
2874fa2d34fdfb381e54298d006788d9a49c612b330b0095dc0b359ea950c961		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x675 5025 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35646
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s).
objstm_0026_00.bin
0357411d4ca0622ffa44d55b9617d3649c83f51e65059452152d4c8b7f06454b		 pdf-objstm-decoded PDF /ObjStm 26 0 obj (inflated) 306 bytes

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