PDF malware analysis — malicious · d66d9189553f2859

MALICIOUS

PDF

7.9 KB Created: 2009-09-14 19:43:18 Authoring application: Eblasha 8.3.5.10 (via PDF Library 5.6.7.5)

MD5: 0390eb846fe87b617cf79ebe91c944cc SHA-1: aea575c2621b98b119d93155397ebb2895400684 SHA-256: d66d9189553f28591bdd035103aa4a2750018c8dc0cb80a3f5c7ca0db054aca0

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript, specifically in 'javascript_obj0015_001.js', is likely responsible for executing malicious code, potentially downloading and executing a second-stage payload. The use of eval() and String.fromCharCode suggests obfuscation techniques common in PDF-based malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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` `a6776b4290b93943124ae171f6a89990e8d463e65b5077245e47e17bb01ea437`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21243 bytes
`javascript_obj0015_001.js` `d97c0b14c7324bf22252a4615b2070d06ae90fac970bab50dc526b9dce3a51f1`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1B54	193 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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