PDF malware analysis — malicious · bb136e0ab0668bf7

MALICIOUS

PDF

11.0 KB Created: 2010-07-24 22:18:16 +04:00 Authoring application: Ax_LC_ (via 8aef13)

MD5: 8961c94b01c45305fe69775cee83aef4 SHA-1: 62d03ba0da5ef15d3ba00a30a22de56252089dd4 SHA-256: bb136e0ab0668bf745ab7cb2591f69b4b1bb5b0ccc483515b49107721d8158d7

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The eval() call and String.fromCharCode usage suggest obfuscated code designed to execute arbitrary commands. The presence of extracted JavaScript files further supports this. The primary attack pattern involves leveraging these JavaScript capabilities to likely download and execute a malicious payload, although the specific payload and its destination are not discernible from the provided evidence.

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` `dcc986d1a06d2b05e93c54d793230fce3debdca75b8d20d77e3fdcc4895f8fc6`	pdf-javascript-stream	PDF /JS object 11 at offset 0x24B8	496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `bcba5e4f4026cf2279324908a65bb249ef15e48842db1a8f6f43f01a549eab64`	pdf-javascript-stream	PDF /JS object 13 at offset 0x261F	193 bytes
`javascript_obj0015_002.js` `0c5843ea88d8e24859b2bf8e0a2085b4712644dc0affa1fa53e34e512adf9a64`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2720	47 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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