PDF malware analysis — malicious · 31b2e7fa752dc191

MALICIOUS

PDF

60.5 KB Created: 2009-08-17 15:08:49 Authoring application: twJJdBYcOEfyUoTT (via SOUuAYlHMZgDFKzRSz)

MD5: cc50d3499228d72742660cd8d074b0c2 SHA-1: fb6209fe473c0e65a4cbc765d1afba91799ff61a SHA-256: 31b2e7fa752dc191c9fe958cb5bb83c9ead750edca39c685672a3fbfd7ecac9e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1566.002 Phishing: Spearphishing Attachment

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also strongly indicates maliciousness. The embedded JavaScript stream, named javascript_obj0007_000.js, is likely responsible for executing obfuscated code. The specific intent of the script is unclear due to obfuscation, but its presence within a malicious PDF suggests it's used to download and execute a second-stage payload or perform other malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `a3b2c68c0727e32e9a717eca41771e971cd1fcb1e2c55308067902bbedb14a75`	pdf-javascript-stream	PDF /JS object 7 at offset 0x2E4	60348 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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