PDF malware analysis — malicious · 54c26e89b69984bd

MALICIOUS

PDF

12.3 KB Created: 2011-01-16 21:29:50 +03:00 Authoring application: mP3eeTR (via 3eefc)

MD5: e76076f350e57dac4f100e5d33e9be2f SHA-1: cb7901bbd46b0cfa42cbe5c033402ec840c426d0 SHA-256: 54c26e89b69984bdf58215be9645edf9b9d8cd80bdd493258d461c48f76381ed

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains multiple embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and String.fromCharCode for obfuscation. The ML classifier strongly flags this PDF as malicious. The primary intent appears to be the execution of obfuscated JavaScript, likely to download and execute a second-stage payload. The specific JavaScript files extracted are listed as IOCs.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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` `8e8942ab7ea5384f23717b4427ade95023551390134a6e34fad804674d668728`	pdf-javascript-stream	PDF /JS object 11 at offset 0x24D9	2435 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `0b3256bb7c52585e5f7782253bbdea27327d16ac3f27265fa78694d0ecbbe4a9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x292B	1166 bytes
`javascript_obj0015_002.js` `72aa15f5467cef1cd560bf2529353620afa6bf49870516a3436c3805f59acde1`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2BC2	328 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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