PDF malware analysis — malicious · 970ae0bddf393b8f

MALICIOUS

PDF

10.9 KB Created: 2010-07-30 20:22:15 +04:00 Authoring application: q___Jm (via ab8df9f)

MD5: 1d8a25f22122cb1830c5753a724a8935 SHA-1: e6cb4362eac6424c55077f4f6316b72a908009d6 SHA-256: 970ae0bddf393b8f30ef32620d6b615cd50cf4af2676a2c7d4e8353925bb5ac3

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, with several heuristics indicating obfuscation and the use of eval() and String.fromCharCode. This suggests the script is designed to execute arbitrary code. The presence of multiple JavaScript streams, including one with a high eval() score, points to a downloader or exploit delivery mechanism. The obfuscated nature of the scripts prevents a more detailed analysis of their specific actions, but the overall pattern is consistent with a malicious PDF attempting to compromise the user's system.

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` `1f6f7ed56c57ee3b993061ac0ecc459ae8ee21eb156f904f2ffb7af83bfcf284`	pdf-javascript-stream	PDF /JS object 11 at offset 0x242D	509 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 0x2596	193 bytes
`javascript_obj0015_002.js` `2d07533b0cebc85ad848363c76eb0cb07b71d82c5e2e94797f569bd115f26e9e`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2697	46 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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