Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b95c1cfc62a38a4…

MALICIOUS

PDF

639.0 KB Created: @¯;£U+Ê1ÃíCs8ð<ËÍç!a¬ˆDvì!•®}«=)X‚®fòïx»„ <‚& Authoring application: !¹W¢KaÝZ…Ñs2vÒ1sÖ]T"Uؑþÿ\œaÓ®µ>RÍÊé;¼”ÉR•Ó (via ów>àHšºDŒh§¦è²òvø½€Ü<C ƒèía¬S23£v‚üþ՝@Œ|ØÌä)
MD5: 78f957584e5d264670c9d7ed6a3fe715 SHA-1: e5439325c4caeee1f01a72370a3b40e869e12f2e SHA-256: 1b95c1cfc62a38a4adf5107e26287501a0c5be032269948fd0e42de1d220bd42
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is encrypted, with heuristics indicating that the JavaScript is used to hide the payload. This suggests a multi-stage attack where the JavaScript is responsible for decrypting and executing malicious content. The presence of XFA forms and embedded files further supports a complex document structure designed for evasion. No specific family could be identified due to the obfuscation.

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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