PDF malware analysis — malicious · 88386c51fa7a0ae6

MALICIOUS

PDF

15.7 KB

MD5: 058d7e7ecb5a9b233952f0021fa3632b SHA-1: f0d05b826ec2f709c1d68bc106551b46b9e064cc SHA-256: 88386c51fa7a0ae616bd6d09bec2bc82a8db46425d218062b1cf1ed5ccd3ba76

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a heavily obfuscated 'eval' stager within a large comment. This stager is designed to decode and execute arbitrary code, a common technique for downloading and running further malicious payloads. ClamAV detection as 'Pdf.Exploit.Agent-36086' further supports its malicious nature. The document body is unreadable, so the rationale is based on the script behavior and heuristic firings.

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` `7dddd08ec4e287def88b21551435dab9219bc9a31bfaa5070f94f977baf54281`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425638 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).
`stream_002_off00003d2f.bin` `d8787d2b5b0b51691079c3d089020d848e7aa506fa23f865ee6fc113e2c7e6ad`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D2F	200 bytes

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