PDF malware analysis — malicious · 3d34264ffd03e998

MALICIOUS

PDF

11.0 KB Created: 2010-08-20 12:30:38 +04:00 Authoring application: dBMk_q (via bd2ded9a7)

MD5: 236dcad1fe19ff2389abce63531039f6 SHA-1: a87505e0f17ec710f6ad2b9ae3d849c8c81eac1e SHA-256: 3d34264ffd03e998d9e5c96950c622c66565428e0f0339d92a5dce52dab06ea2

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode() functions, indicating obfuscated code execution. The heuristics suggest that this script is designed to download and execute a secondary payload. The obfuscation and the use of these JavaScript functions are common techniques for delivering malware.

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` `c405647a618b59b89b94fca19cfd32e24fd0693737565c5754937dcd7235a707`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2492	500 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 0x25F7	193 bytes
`javascript_obj0015_002.js` `8a6ae74e49221c84336a8b9b9b620613c8b09e35c50a9a2179f6c357a16a621f`	pdf-javascript-stream	PDF /JS object 15 at offset 0x26F8	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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