PDF malware analysis — malicious · eb1c853a8f9a12c7

MALICIOUS

PDF

6.9 KB Created: 2009-09-15 19:46:53 Authoring application: Eblasha 7.4.7.1 (via PDF Library 10.1.4.8)

MD5: cd6323a42b6ebfab1fc1b2d80fb7942a SHA-1: 76e8f6f17f4144c0f8dd36dba08547f61509d4af SHA-256: eb1c853a8f9a12c7082d5d650c694e18e5f62d8a28346014bb3a286a90b27689

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscated code execution. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be exploiting a PDF vulnerability to run this script, which is likely designed to download and execute a secondary payload. No specific family could be identified.

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` `b9fe9b6432ae2b00b5deeeec47571ab870ae6b085c70aa247dc19c0340a8407d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36B	21286 bytes
`javascript_obj0015_001.js` `80f30c57030bfbd5f49c00ef5ed9088d499dc8e6e58c9b0b33275ae95daf6906`	pdf-javascript-stream	PDF /JS object 15 at offset 0x1799	217 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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