PDF malware analysis — malicious · a35a9503f698244a

MALICIOUS

PDF

118.6 KB

MD5: 8a0abf8924a6e812b8d7bd3b77fa4328 SHA-1: 5dbb93da9f553188a816162f591a9158911f53b2 SHA-256: a35a9503f698244a32ef7acb5e192c0acfdd09e6defd851a24dfa18a6c008161

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, identified by heuristics such as PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. A critical heuristic, CLAMAV_DETECTION, specifically flags it as 'Pdf.Exploit.Agent-36086'. The JavaScript appears to be a stager, likely responsible for downloading and executing a secondary payload, as indicated by the 'Large comment-padded JavaScript eval stager' heuristic. The document body was unreadable, but the presence of obfuscated JavaScript and the ClamAV detection strongly suggest a malicious exploit delivery mechanism.

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` `49e239080134cc2466924fbb95f2905a4037217b93e5d8fed31a776b81704e42`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627308 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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