PDF malware analysis — malicious · 3301f9e725b1bc03

MALICIOUS

PDF

15.7 KB

MD5: 0f684aba3f8ccf00c9113043aaea0c4e SHA-1: a1d5b58fcaf3e7dcf2c6fab61aec90a4eb869279 SHA-256: 3301f9e725b1bc0337ab5e2d44aed99c08bb42fc079d4011ccd3ab48a54936e3

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains multiple JavaScript streams, including one with a large comment-padded eval stager. The presence of eval() calls and String.fromCharCode indicates obfuscation, typical of exploit delivery. ClamAV identified this as Pdf.Exploit.Agent-36086. The primary attack vector appears to be the embedded JavaScript, which likely attempts to download and execute a second-stage payload.

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` `ee5d6c633717426ae74f9e73c6dfb0929d8c33f506d33f6d6d3e6a29dff0afd3`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	426099 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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