PDF malware analysis — malicious · c923fece7117b693

MALICIOUS

PDF

26.2 KB Created: 2011-72-51 03:25:00

MD5: db056224004692a918166e4d6c5de11d SHA-1: 4de5929cfc4adee265917e41d5da32e2cf0e037f SHA-256: c923fece7117b6935d0a748fecbeb3678a0abd7807ca05cc17878fcb09ff2028

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious JavaScript

The PDF file was flagged as malicious by an ML classifier with a high score. Static analysis detected embedded JavaScript, including a call to eval(), indicating that the script is likely obfuscated and designed to execute arbitrary code. The presence of JavaScript actions and streams within the PDF points to a common delivery mechanism for malware. No specific family could be identified, but the techniques used suggest a downloader or exploit loader.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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_obj0001_000.js` `83f07af33af1e18d9cca5d209f40baa16c46d1396dbeb1b5a42d17eebfed7866`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6447	934 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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