PDF malware analysis — malicious · bdd1fb75dc83411f

MALICIOUS

PDF

55.0 KB Created: 2009-05-22 02:58:05 Authoring application: wxbcXMaeaMvgux (via XglUmPAUubjveXizYymyr)

MD5: 28173ad2ee4dd72df7a3e859a931fdde SHA-1: ab84e09b0c96b8dd165aae8c7b23033b078ecee9 SHA-256: bdd1fb75dc83411fe04e330de97d7cf678822f18605503503280e66904ebd289

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Dropper.Agent-7217267-0. Static analysis revealed embedded JavaScript, including the use of eval() and String.fromCharCode, indicating obfuscation. The ML classifier also assigned a high probability of maliciousness. The primary function appears to be executing obfuscated JavaScript, which is a common technique for downloading and running further malicious stages.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7217267-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7217267-0
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` `f502d34926a5c93a5145cdc7b114798578186b1aad07c4cbaa7e5ae5ae8cd803`	pdf-javascript-stream	PDF /JS object 7 at offset 0x377	54738 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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