PDF malware analysis — malicious · 97f9e80be6086e03

MALICIOUS

PDF

15.8 KB

MD5: ed1bb7503249b22d0b1aea8d2d9a1970 SHA-1: a953e753da388ee1a52ac6e05a5d71d3c7fb18e1 SHA-256: 97f9e80be6086e03b3e752aa854ae75e6da4fea0281ad8bf2d2ea677e754d1a6

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, including a heavily obfuscated eval stager. Heuristics indicate the use of eval() and String.fromCharCode, common techniques for code obfuscation and execution within PDF documents. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests an exploit or malicious script is present. The ML classifier also flagged this as highly malicious. The primary attack pattern involves exploiting PDF vulnerabilities to run arbitrary code.

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` `cb3abd6d9a206c4efb1cdfed3d805353709903539712fc4724b7fe8de50c7645`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425393 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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