Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3871c0efd42cc9…

MALICIOUS

PDF

175.3 KB
MD5: c5c4a96a64a1e67eb11277a2036bcf23 SHA-1: 1f52714592ac11b9a217f5984c0303e4b3c8e8c6 SHA-256: ff3871c0efd42cc940bccba4878be3f4a9f24c3fb458362b8e9ca1a81113042e
246 Risk Score

Malware Insights

MITRE ATT&CK
T1559.002 Component Object Model Hijacking T1204.002 Malicious File

The PDF file contains embedded JavaScript and RichMedia (Flash) content, which are often used to exploit vulnerabilities. A secondary embedded PDF was also found with similar suspicious findings. ClamAV identified this as 'Pdf.Exploit.Agent-35955', indicating a known exploit. The embedded artifacts, including a SWF file and JavaScript, suggest an attempt to deliver a secondary payload or exploit.

Heuristics 8

  • 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-35955 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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
  • 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xYBMrOvRxmKTs.swf
c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x173D 26774 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
javascript_obj0006_000.js
647264875a14573e23e4a4f2f4ed957f818b38e4f2c11198f8da355fc5e510d4		 pdf-javascript-stream PDF /JS object 6 at offset 0x148 4461 bytes
polyglot_child_pdf_off00023ba3.pdf
6d5b616558491dae6ae8894c3d4e7698c994d4ba9305011c4ae1b717cdfee8d7		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x23BA3 33119 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: unlikely

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