PDF malware analysis — malicious · 805cf1729e4749c0

MALICIOUS

PDF

2.9 KB Created: 2009-01-09 23:22:34 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 2a476a031f06a44fc62edc1029cfc5bf SHA-1: 66666297835590e793ef56b83c7a6a489a7b253f SHA-256: 805cf1729e4749c03fe7a2dd3f50b2954dfbaaa23f31bdbb0475b68cec712341

130 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, with high-severity heuristics indicating the use of eval() and unescape() for obfuscation. The ML classifier strongly flagged this PDF as malicious. The presence of two JavaScript streams, one of which is significantly larger, suggests complex malicious scripting. The primary intent appears to be the execution of obfuscated JavaScript, likely to download and execute a second-stage payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' heuristic and the nature of the embedded scripts.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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_obj0001_000.js` `c8a62f967b403151f005234653e0f73f8a429dc887d2392f40b67c4b99b62c00`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	35 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `af7aae820b4e5683297769a2329e1c0e5cca561c14470c6708239e85579ff9c7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x41F	4451 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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