PDF malware analysis — malicious · a29d50f620c41ddf

MALICIOUS

PDF

15.8 KB

MD5: 67087d6fc9c73e9693ee8d5c30f721f1 SHA-1: f7b8baf7375b74709af1ca4163f09c6d573caf12 SHA-256: a29d50f620c41ddf74116cd4c64650965a8592d45f1e7219c19907120f4d1e9b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The critical ClamAV detection and multiple high-severity PDF heuristics indicate this is a malicious PDF exploiting a known vulnerability. The embedded JavaScript stream, specifically the 'Large comment-padded JavaScript eval stager', strongly suggests it's designed to download and execute a secondary payload. The presence of an extracted JavaScript file further supports this. The document body is unreadable, but the technical indicators point to a typical 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` `5c0b09ae28faa76a0f13e300ca5e16f63ef11a371393d08a7b84fdec24b0ed74`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425927 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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