PDF malware analysis — malicious · f976fc468e0d52cf

MALICIOUS

PDF

118.6 KB

MD5: 939633ea0f70140caf6f0fd0018914b6 SHA-1: fd8c6d75f304de0b12628247006c3558ea1fdc9a SHA-256: f976fc468e0d52cfa734d31e1e1d5bc73bc1220e39c425c8efb3245f3f6266fa

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded and obfuscated JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristic firings. The presence of PDF_EVAL and PDF_JS_LARGE_COMMENT_PADDED_EVAL suggests the script is designed to execute arbitrary code, likely to download and execute a second-stage payload. ClamAV detection as 'Pdf.Exploit.Agent-36086' further supports this assessment. The document body is unreadable, so the rationale is based solely on the script and heuristics.

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` `e5026bb50d16234e52ef322472c5d0505c19a6bbdbe73bcbe72d68894c7b14aa`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627399 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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