PDF malware analysis — malicious · 97cca46ebe6e202f

MALICIOUS

PDF

118.4 KB

MD5: 39a87798f91605d287fa2dd464d8dccc SHA-1: e4a18523830b45069486971673439f5fd32e7b7d SHA-256: 97cca46ebe6e202ff8f27d46f22f59469b52648ff39a59a394a6e5e598a1dd96

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file exhibits malicious behavior through embedded and obfuscated JavaScript. The heuristics indicate the use of `eval()` and `String.fromCharCode`, common techniques for code obfuscation. The presence of a 'Large comment-padded JavaScript eval stager' and ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests the script's purpose is to download and execute a secondary payload. The document body itself is unreadable, providing no direct clues to the lure, but the technical indicators are clear.

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` `76514a2a001c89c5fa3c6b566bf8cf6d518a7de4994adab49042741b54dbc559`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626822 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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