PDF malware analysis — malicious · 2e90e0d3a256aeeb

MALICIOUS

PDF

15.7 KB

MD5: e26d0ea09ec2728caceb97894c90297a SHA-1: 4d8aee584be4fe53ca883622e30b70e53c13ad0d SHA-256: 2e90e0d3a256aeebf2461a6eaff8e6b691f9da702c768be283236a083443610b

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a large comment-padded stager that utilizes eval() and String.fromCharCode(). This strongly suggests an attempt to obfuscate and execute malicious code. ClamAV detected this file as 'Pdf.Exploit.Agent-36086', indicating a known exploit. The ML classifier also flagged it with high confidence. The primary attack pattern involves exploiting PDF vulnerabilities to run arbitrary code, likely for downloading further malicious content.

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` `45e6962e3b8668b56dd7496703c39561b9da556fd64a8f4a5d806af71c6cd24f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425107 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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