PDF malware analysis — malicious · e3d04bf1c90f2d68

MALICIOUS

PDF

118.5 KB

MD5: f6a195ce04a3b8adcfe47ee84e39909a SHA-1: d3cee6c59aa63d72a85d93a494d680f6d3eb67f4 SHA-256: e3d04bf1c90f2d680f328a06a4c7edbb09ccf408a180c2e708a7e2d29fce39ec

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV (Pdf.Exploit.Agent-36086) and a machine learning classifier. High-severity heuristics indicate the presence of JavaScript with eval() calls and a large comment-padded JavaScript eval stager. These point to the execution of obfuscated JavaScript code, which is commonly used to download and execute further malicious content. No specific document body text was available for analysis, but the technical indicators strongly suggest a malicious exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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. (matched inside decoded stream)
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_obj0006_000.js` `e21f8709f134ed262eb5e538d4fc803da22243060cf85f1373fb3c658b4df25f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626544 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).

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