PDF malware analysis — malicious · ac3b9581bfc13b7e

MALICIOUS

PDF

118.5 KB

MD5: 02b753835a9b17167b9da33fba2db71d SHA-1: 9a00048d4faf1826055845721de579c709d97085 SHA-256: ac3b9581bfc13b7e031e776137f53c2c4e73e24885b6fca3dd80cb733492d6e5

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file exhibits multiple high-severity heuristic firings related to JavaScript execution and obfuscation, including `PDF_EVAL` and `PDF_JS_LARGE_COMMENT_PADDED_EVAL`. ClamAV also detected it as `Pdf.Exploit.Agent-36086`. The presence of large, deobfuscated JavaScript streams strongly suggests the file's primary purpose is to act as a stager, downloading and executing further malicious content. The document body is unreadable, providing no contextual clues.

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` `9ae66203ea32a91dcbec7aef1afb05321aae6c5e067d261d00d3ac85bed7979e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	625996 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` `95fed7b9ab21ddae7aabcb1d4394042fad091ad2bc5b5f2b05e73fc5b9779023`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 634 long base64-like blob(s).

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