PDF malware analysis — malicious · c89926f36ba1395e

MALICIOUS

PDF

118.7 KB

MD5: 0b7f19954133aca04ca5b4d4bcfa4d32 SHA-1: b597ac8ecd86ae5c4c389c8377d14c846108b15c SHA-256: c89926f36ba1395eaab31084b9b0b16fb29afd72e5716b8a7555c6e7e1dc2a0f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscated code execution. Heuristics suggest this JavaScript acts as a stager, likely downloading and executing a secondary payload, as indicated by the ClamAV detection of 'Pdf.Exploit.Agent-36086'. The presence of a large JavaScript stream and the 'Suspicious extracted artifact' heuristic further support this. The document body is heavily obfuscated and unreadable, providing no direct clues to the lure.

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` `503311770d80db90d41ccd9a7c760385341bf22bffecadf51d81e147750c4758`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626866 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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