PDF malware analysis — malicious · 3e6c7f1d4b940bec

MALICIOUS

PDF

11.4 KB Created: 2010-08-24 17:10:08 +04:00 Authoring application: Eb__Sn7 (via 38ef4)

MD5: 3b26773bc31ffc6869f683b7d1770490 SHA-1: 41ed3e59baeacc288efc5e16c853acedcf18ff74 SHA-256: 3e6c7f1d4b940becebbe64bb41841fb252390be2de93dd0c16e1923eb0b44393

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, with one stream exhibiting an eval() call and another using String.fromCharCode. These heuristics, along with the presence of suspicious extracted JavaScript files, indicate that the document is designed to execute arbitrary code. The JavaScript likely downloads and executes a second-stage payload, which is a common technique for malware delivery. The specific JavaScript files extracted are considered IOCs.

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` `e848b18b8f81ed85bc19bfed2227683da055733bf9da8d570526438718f326d1`	pdf-javascript-stream	PDF /JS object 11 at offset 0x23FA	1131 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `b2df8df3cee9f15674710d0646bb079c69d3703e67a549a2c2b2f9e00dcd4ed3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x2697	507 bytes
`javascript_obj0015_002.js` `19c4f0c0b954628b37aafad1abd0b1b69069c2f5e4fdf64da0296cf240d60280`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2840	132 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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