PDF malware analysis — malicious · e0122e944486b1fd

MALICIOUS

PDF

11.4 KB Created: 2010-10-25 23:26:41 +04:00 Authoring application: p_RYiIbf (via 6199537301)

MD5: af0499b6a1ed0fc2242f41732abfa11f SHA-1: 63d0fba49c22214e5fec486cf727507e2c9f6582 SHA-256: e0122e944486b1fdee3b28fa366260ca1830574fab6cea4acb7e1a66f54ad7a6

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and String.fromCharCode, suggesting obfuscated code execution. The ML classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, which is a common attack pattern for malicious PDFs. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `9f5f73a7ae4a1002a8d9b4a6b9968bee3b0ce8b09c79b47df1be7685d20e4cce`	pdf-javascript-stream	PDF /JS object 11 at offset 0x23DB	1099 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `037816050348216f1341cf2804f5d0bd18e08f40da0ecf21641f90048f2a9d94`	pdf-javascript-stream	PDF /JS object 13 at offset 0x2664	485 bytes
`javascript_obj0015_002.js` `21416e085196486cd64e07d5f47b486c3f47f7d86ab3ddd4f91993c691f03422`	pdf-javascript-stream	PDF /JS object 15 at offset 0x280D	130 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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