PDF malware analysis — malicious · b262b77aab329542

MALICIOUS

PDF

12.0 KB Created: 2010-09-14 16:55:54 +04:00 Authoring application: A2_raYp (via 091bc54402)

MD5: 3e7e6eab56bc405848d6aa1409e9359f SHA-1: 1221ef90936e5614eba5b5d49e37fc1da2e93527 SHA-256: b262b77aab32954235918687cd2a6a8ecb54feb90cc1ec8cf15b1ea1abeab99d

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, with multiple heuristics firing for JavaScript execution and obfuscation, including eval() calls. The JavaScript streams are obfuscated, but the presence of eval() and fromCharCode suggests dynamic code execution. The primary intent appears to be downloading and executing a second-stage payload from external resources, as indicated by the obfuscated JavaScript streams.

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` `613f64102491de6323f2dcd355745a6e63e43e7cb2fb50dcaa07937f2950d964`	pdf-javascript-stream	PDF /JS object 11 at offset 0x239B	2399 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `c9bfdd075468b51f031e029ce1a4f299fa35e0771344b0aa9c225b02d2b1d009`	pdf-javascript-stream	PDF /JS object 13 at offset 0x27D8	1105 bytes
`javascript_obj0015_002.js` `517243e0d5b0a944a1d2ca613e23166798c54e8785d76e4e57a0bf490f454241`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2A43	290 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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