PDF malware analysis — malicious · 2a5c44168a78e801

MALICIOUS

PDF

11.0 KB Created: 2010-07-30 08:30:53 +04:00 Authoring application: tTvMLW (via 96c4e55b0)

MD5: 37389e80ca82ddde175002b254c77515 SHA-1: c3f14988f71dd1f91b44f5e31bb84db93fe287a5 SHA-256: 2a5c44168a78e801ddc526e4a3f54ebb927779131e7eff1148b5db58ed002570

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF 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 JavaScript is being executed. This script is likely responsible for downloading and executing a second-stage payload. No specific family could be identified due to the obfuscation.

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` `6f3ecd32f3f0de1a2dbcab9745193ca5c0d7e6524895de4793521d7e3aa4ed12`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2460	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 0x25C5	193 bytes
`javascript_obj0015_002.js` `f0d975fed4c049ca64e78e35dce23593a96c4b7a182828636733307a421533ff`	pdf-javascript-stream	PDF /JS object 15 at offset 0x26C6	45 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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