Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac705860b71aed9…

MALICIOUS

PDF

925.5 KB Created: BFO&;á0²LÇp]M9¹?ÝËJ8˜ÆGmÜw°.ېp’`›’¸^ÐóNÝ©» Authoring application: Rêî®t»ÍÕ¨]àÞÿ?Æ×Ñó¬yÜzYJCD°·ñp™¢szÔ\-|ݮϭHcv (via /å=ùìO]ÄM"@?§ï‰™¹jv2ˆ.ø`­\]5øùg ~gÞl¨¡^pfP)
MD5: 0d711f2049a6004cffe447dab78cd7e5 SHA-1: c28fd9c35d97293b7e9b0eaf2032e83e23ca78a4 SHA-256: 2ac705860b71aed9b7528a62ed1042723f6f7b4c16fb0edf4cddcf09a709c9f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV (Pdf.Exploit.Agent-30150) and a machine learning classifier. It contains embedded JavaScript and is encrypted, indicating an attempt to conceal its malicious functionality. The presence of JavaScript actions and embedded JS streams, combined with the encryption, strongly suggests that the PDF is designed to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-30150 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-30150
  • Encrypted PDF carries /js — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/js). 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.
  • 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 paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

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