PDF malware analysis — malicious · aebf63ae868cbd39

MALICIOUS

PDF

118.7 KB

MD5: f617ea42b428c1aab6895d227d86cdcf SHA-1: 981bfcc94006b91bd291935ddb12b6ac14b1f208 SHA-256: aebf63ae868cbd390d9615633d9d55860ded8bb8b4939e1bc4c1ca8c7fdb7f75

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple high-severity heuristics indicating embedded JavaScript with eval() calls and a large comment-padded JavaScript eval stager. ClamAV also detected this as Pdf.Exploit.Agent-36086. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, which is a common technique for initial access and further system compromise.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `08963c2da8950ddb79e08827f5fcab5dd68bbb5c552d642c4aff0d204656be9f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627076 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_001_off0001d71f.bin` `ed9d6722fcfc1f84334f5c4024bdd8e0e985c03b1757d1082acb12af23af3fdf`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D71F	300 bytes

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