PDF malware analysis — malicious · bc04d75b2ff3f0f3

MALICIOUS

PDF

7.9 KB Created: 2009-09-07 19:44:80 Authoring application: Eblasha 1.10.3.8 (via PDF Library 2.1.10.10)

MD5: f0e289832ba52b03c4e0e4c70de92f1d SHA-1: d1763cae9822c0423eaaaa77fc7f7fe027710754 SHA-256: bc04d75b2ff3f0f3fe67c178d48ceb663c5f5c3de06315f0f91c5cca2d574e51

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also strongly flagged this PDF as malicious. The JavaScript stream, specifically 'javascript_obj0015_001.js', appears to be obfuscated and likely responsible for downloading and executing a secondary payload. The presence of eval() and String.fromCharCode further supports this malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `4caaf76eea95ed8dbc20b387c898f650e62fd04d57936185821ef184aeb25c4b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21312 bytes
`javascript_obj0015_001.js` `924b2496089361369279a8171bcd9a8edf8862a27a9be67034cfc2dbda1305a4`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B91	181 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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