PDF malware analysis — malicious · d95fbe6094655ba8

MALICIOUS

PDF

15.7 KB

MD5: c87a94dc68a0656c5b04c2c79d4d1b7a SHA-1: cfe4561276bb3c80965b3a4aae56269fbc96e337 SHA-256: d95fbe6094655ba817cb56df0f4966ecb3d5735229e5cd7f7bc2b2d21eadf01d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, with high-severity heuristics indicating the use of eval() and a large comment-padded JavaScript eval stager. ClamAV detected this file as 'Pdf.Exploit.Agent-36086', strongly suggesting it's a malicious PDF exploit. The embedded JavaScript is likely responsible for downloading and executing 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `05d0655110db71ae83a094b73849e3679a4d4e0c6aa5b4d4bde80e0f1b94df18`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425033 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).
`legacy_pdfkit_stage_000.js` `de88a213b8bdf4767a0ba4e86cbbb88367b3ecd54697b8d4693d6ac88e952300`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 669 long base64-like blob(s).

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