PDF malware analysis — malicious · 531d3d40946e59ec

MALICIOUS

PDF

26.6 KB Created: 2006-02-01 14:14:12 Authoring application: Wegoptyr (via HghTc6Fs)

MD5: fdcf2b9803f7ef55c9c90bfa7627c0e9 SHA-1: 09e582b90839848ac54662a6d55b161b79040cf9 SHA-256: 531d3d40946e59ec1e02620d50165a6fed9b6ea52ce7cc58508f561537045a00

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Exploit.Agent-22677 and a high-confidence ML classifier. Embedded JavaScript, including a call to eval(), indicates the execution of obfuscated code. The script attempts to reconstruct a string using concatenation, likely for malicious purposes such as downloading a second-stage payload. The presence of multiple JavaScript streams and the eval() call strongly suggest an exploit or downloader.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-22677 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-22677
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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_obj0007_000.js` `cf430abb5d8671b000895b11a6619ad06b83c51ca95169ef76e1d39b78ad1195`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	26120 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `96e3f389fa80f0495d145648a1704f6021fc7d09ad7858992f84c5db61498268`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EE	471 bytes

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