PDF malware analysis — malicious · 90a568329fac7df9

MALICIOUS

PDF

39.1 KB Created: 2010-12-06 13:22:29 +02:00 Authoring application: Fast Faxless Payday Loans (via mPDF 5.0)

MD5: 98d60cac251b0223938d02c368dedea9 SHA-1: e1f83146776fdcfe3b18a481e17b895459a4275f SHA-256: 90a568329fac7df93640319b8d1fd7386171732ff2ae2d4216ada767a9a82f54

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests malicious intent, and the presence of unescape() calls points to obfuscation techniques commonly used to hide malicious code. The extracted JavaScript files, javascript_obj0027_000.js and javascript_obj0027_001.js, are likely responsible for executing the exploit. The document body is heavily obfuscated and unreadable, providing no direct clues to the lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0027_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 27 at offset 0x93FC	136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`javascript_obj0027_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 27 at offset 0x93FC	134 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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