Malicious PDF — malware analysis report

Static analysis result for SHA-256 a210fd767447f500…

MALICIOUS

PDF

19.8 KB Created: ƒÆZóU õÖÜ^hvlؙc;°ÀT° Authoring application: 9h”eCňìX+]E (via 9hŒeAńìX]QêÈHböôð—<ÜE=]š>T0؂Iÿ)
MD5: 01289f8937193fd87a45330aa1621b2b SHA-1: 4c1ac0bc9181c8dec772a456f7ad9bf8fc66a115 SHA-256: a210fd767447f5004373973fe80f42c00db38bfc508fba83b7050dbdb86989ae
146 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1553.004 Subversion: Mark-of-the-Web Bypass

The PDF was flagged by ClamAV as Pdf.Exploit.Agent-7312, indicating it contains known exploit code. The presence of encrypted JavaScript within the PDF, combined with an OpenAction, suggests an attempt to conceal and execute malicious code. The ML classifier also strongly indicated maliciousness. While the exact payload is hidden, the overall pattern points to a malicious PDF designed to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-7312 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-7312
  • Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/OpenAction). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
89f5c6e4832ac7a980736d8a96df071fcc3a62d5c8a9d7d5e78b81327f2bfa14		 pdf-javascript-stream PDF /JS object 12 at offset 0x35F0 5150 bytes

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