Malicious PDF — malware analysis report

Static analysis result for SHA-256 3145491338144393…

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: 76c326d9775093059f8008ece92ade0d SHA-1: 1bb0b7e8e7c52dcd5607e487c1be2c848a5790f5 SHA-256: 3145491338144393805b54bfe6ca840425bcfad7b8c2bee945a5f93ba0a46252
74 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file is heavily obfuscated and encrypted, with JavaScript embedded to conceal its true payload. The presence of PDF_ENCRYPTED_WITH_JS and PDF_JAVASCRIPT heuristics indicates that the JavaScript is likely used to bypass static analysis and deliver malicious content. The PDF_IMAGE_ONLY_LURE heuristic suggests a deceptive tactic to trick users into opening the file. Due to the obfuscation, the exact nature of the payload and delivery mechanism cannot be fully determined, hence the 'unknown family' classification.

Heuristics 6

  • Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/JavaScript). 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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