PDF malware analysis — malicious · 34c4a3d8630396c0

MALICIOUS

PDF

10.9 KB Created: 2010-08-03 17:49:21 +04:00 Authoring application: AJpt_7 (via 16f86429)

MD5: 2543d6f40627babc225d125fdb791390 SHA-1: 72cee09e73f07474661b7cfba1fe6f312b0e0955 SHA-256: 34c4a3d8630396c031cf30fd0f4289a8f9b84b26181049a9d085768fd4c1865f

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple embedded JavaScript streams, with one stream exhibiting eval() calls and String.fromCharCode usage, indicating obfuscated code execution. The presence of these JavaScript actions strongly suggests the document is designed to download and execute a secondary payload. While the exact payload is not discernible from the static analysis, the techniques used are common for initial access and execution stages of malware delivery.

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` `e31bae17bc8bad33fd233a796904cfd4c641adfa1ffb9acd5367ca62b6ff82b9`	pdf-javascript-stream	PDF /JS object 11 at offset 0x23F8	513 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 0x2560	193 bytes
`javascript_obj0015_002.js` `bd67752b4e75ed2549a6af8b4d7db2fb715dfec408369cb0ad6aa7958d8d997f`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2661	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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