PDF malware analysis — malicious · 4c5bf41ac0f05bbd

MALICIOUS

PDF

118.4 KB

MD5: a29b4f920801862655a81ad3586bc9da SHA-1: ee60a0e943c1e6c3884ddbc3dfa37bc327609e57 SHA-256: 4c5bf41ac0f05bbd79d35e2c23e9c0cbf6e2c5367eaf4ab83f013c73be8ae6d6

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscated code execution. A critical ClamAV heuristic identified it as 'Pdf.Exploit.Agent-36086', strongly suggesting it's designed to exploit vulnerabilities and download further malicious content. The presence of a large, comment-padded JavaScript eval stager further supports this. The primary attack pattern involves leveraging JavaScript within the PDF to achieve code execution and payload delivery.

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` `f5a9da8d152230ddfaecff7b5dc15f93ebd932f73d0b806552bfb4cd1e0e9523`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626489 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).

Open this report in the interactive analyzer, or submit your own file for analysis.