PDF malware analysis — malicious · 554dd93540945423

MALICIOUS

PDF

15.7 KB

MD5: 34bd81f12812475e2e3c8ee414d47331 SHA-1: 8b020c7ef180b4078e83e316ae6cc04b291d46cd SHA-256: 554dd935409454233e6b57bc743ef644b3ae84a5f8db416bb4cfac6320219d71

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a call to eval() and a large comment-padded JavaScript eval stager. ClamAV detected this as Pdf.Exploit.Agent-36086, indicating it's a known exploit. The presence of JavaScript and the eval stager strongly suggests the file is designed to download and execute a secondary payload, a common technique for malware 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `7ff1320cfbac19b8d9f6d5af9e79b9b36b91902d33e4b9401603863026cb4cee`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424582 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` `eed2a1e2414eef0cb2bec230b564dfef6065cfc8d4fe497b5a02d155ae091ab0`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262090 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 643 long base64-like blob(s).

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