PDF malware analysis — malicious · c1b5e7694cc36f56

MALICIOUS

PDF

15.7 KB

MD5: 6cff73354127a01b91ebd5dbb00fd5fa SHA-1: 34873994478a0165137fe17aede65255cd4a4033 SHA-256: c1b5e7694cc36f565d2094ac972bb9cd15abfab7d74fc7c8e8cfe0c51c9ddc5c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains multiple JavaScript-related heuristics, including a large comment-padded JavaScript eval stager and a general eval() call. ClamAV also detected this file as Pdf.Exploit.Agent-36086. The embedded JavaScript stream, named javascript_obj0006_000.js, is highly obfuscated, but the presence of eval() and fromCharCode suggests it is likely attempting to download and execute a second-stage payload. The document body is unreadable, providing no further context.

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` `9fdb599a2a0ebbc8c7a96c65aca83d39d0ab73b2ea4d305a4903de85269d8e0d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425641 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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