PDF malware analysis — malicious · a080d77cdd2436f4

MALICIOUS

PDF

15.7 KB

MD5: cb60fc2a5ddf25f2780568de7d2c2c7e SHA-1: 039a3f5f1abc3529a642fd7d11a8b98d5fd2a235 SHA-256: a080d77cdd2436f493b32fdd82868b492473365399d1663be211c7eaa4f7e3dc

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a large comment-padded eval stager. Heuristics indicate the use of eval() and String.fromCharCode, suggesting obfuscated code execution. ClamAV detected this as Pdf.Exploit.Agent-36086, a known exploit. The embedded JavaScript streams, particularly the deobfuscated one, are highly suspicious and likely responsible for downloading and executing a secondary payload.

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` `7c5d457e56a2d44159c40f8c95caa5645037ba686f0866a8dc04a500e2d93eee`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425812 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` `8168ff3f0d16018addc78707de50f90592d8a117c05b485aa1096a62e71df53b`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262092 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 558 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.