Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b131fe7f40d5811…

MALICIOUS

PDF

33.6 KB Created: þÃcqR‘o Œ{£›<u\@¿mÞ­ Authoring application: DQ6¡2;ØJå©gF (via DQ6¡8;ÝJä©kF kÏ)
MD5: 8f7f50a0e88ef4a8abcf8d5e1b031515 SHA-1: 7b019798a94140605b3069b5621be8b8d74fda70 SHA-256: 1b131fe7f40d5811587a7457f753ad6f33df4df459fd4867e4c614f19f5f259b
64 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, which is also indicated by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_ENCRYPTED_WITH_JS' heuristic suggests that the PDF is encrypted and uses JavaScript to conceal its payload, making it difficult for static analysis. The embedded JavaScript is likely responsible for executing the malicious content. No specific IOCs were extracted from the provided evidence.

Heuristics 4

  • 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.
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0009_000.js
65e5092313aa77fa3ddb51271a58c820420e8cde8af343fd43483af1de73ffb0		 pdf-javascript-stream PDF /JS object 9 at offset 0x3D7 31714 bytes

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