PDF malware analysis — malicious · 896d62513e0304b0

MALICIOUS

PDF

35.8 KB Created: 2010-02-23 21:52:26 Authoring application: GUYwcmUjkHnDVR (via dwkTIYwEsNRXimZ)

MD5: ec77085680f4c49240c1e6b4bca063fc SHA-1: e6305514dc1888e35f8948aeb45b0dcf4ac3cb4b SHA-256: 896d62513e0304b0e27da0cc9624ef11236ae1e71a32f0a31956c4255a5832cb

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly indicates maliciousness. The JavaScript stream, identified as javascript_obj0019_000.js, is highly obfuscated but the presence of eval() suggests it is designed to download and execute a second-stage payload. The document body is unreadable, so the rationale is based solely on the script's behavior.

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_obj0019_000.js` `d9c48ff4c6e1dcd098355ab51060bf04a7c1282938f3b9b4d11d18cdebb4a983`	pdf-javascript-stream	PDF /JS object 19 at offset 0x4998	16804 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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