PDF malware analysis — malicious · 8f8c4d394b2d8da7

MALICIOUS

PDF

118.6 KB

MD5: 4bdf95484c957f8b36c96cd30039a02e SHA-1: 352ddbf18f5e758d27728da31e9f0e4f4e7d6613 SHA-256: 8f8c4d394b2d8da7fcb58efd859feb2c2cacd46aa9500e504bee2d06d22b44cd

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a heavily obfuscated 'eval' stager within a large comment. This script is designed to decode and execute arbitrary code, a common technique for downloading and running further malicious payloads. The ClamAV detection 'Pdf.Exploit.Agent-36086' further supports the malicious nature of this file. The presence of JavaScript actions and eval calls strongly indicates an attempt to exploit vulnerabilities or deliver malware.

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` `c3708d9dd2ae1f1e23aa93dd09f842d4f94475054e1cab0573619183daf5b066`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626924 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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