PDF malware analysis — malicious · 322aee85814c6f4c

MALICIOUS

PDF

15.7 KB

MD5: aeeb6a470684f4a864bcc05e25c29de6 SHA-1: 68d02c568b5d4e6bd4d620975fbc03359bd6c571 SHA-256: 322aee85814c6f4c32c67487a52101a5a6764f6870b2ed5b6a797ae8c4a888fa

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF file contains multiple JavaScript streams, including one with a large comment-padded eval stager. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is a known exploit. The embedded JavaScript is highly obfuscated, but the presence of eval() and String.fromCharCode() indicates dynamic code execution, typical for downloading and executing further malicious content. The document body is unreadable, so the rationale is based solely on the script and exploit indicators.

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` `7dece05f10674cace4ca8a8fe03cc385c97c71b4aaf4c8fa02cee2049d43c406`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425190 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` `f9b2162d3d610f4dad7c0f42af28b0f70feabe8886d4d461913c354535b93663`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 643 long base64-like blob(s).

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