PDF malware analysis — malicious · 8ce8335110280a3d

MALICIOUS

PDF

118.7 KB

MD5: 0f95cd1db788ffd7d97761da45353c47 SHA-1: ad3998f60b8f2dfa326221a5538e3c95d044424e SHA-256: 8ce8335110280a3d217272def2c4d4b03c56382dc94e5de011f6db93f6741817

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical ClamAV detection and multiple high-severity PDF JavaScript heuristics indicate this PDF is malicious. Specifically, the 'Large comment-padded JavaScript eval stager' heuristic and the presence of embedded JavaScript streams suggest the file is designed to execute arbitrary code. The eval() call and String.fromCharCode usage within the JavaScript are common techniques for obfuscation and payload delivery. While the exact payload is not visible, the overall pattern points to a downloader or exploit dropper.

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` `09823c6d9d53d99a48d9cc6c447da098707cd57228ac531356b30e6c59fa90d9`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627195 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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