PDF malware analysis — malicious · ab65a49430f67dee

MALICIOUS

PDF

15.7 KB

MD5: fceb41354bfe515f0704cb03d3feb3ce SHA-1: 3ff6cb15822ea2bcf0671a5db72f7ea76b667c43 SHA-256: ab65a49430f67dee2a303f8c2fceb7c6f45a9cf7a3e19fe55cfeb397a02056e1

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, including a large comment-padded eval stager. This JavaScript is designed to be executed when the PDF is opened, likely to download and execute a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript actions and eval calls points to a common PDF exploit delivery mechanism.

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` `ebf10780dbef06ccbcfdd9ae13b9428b600350089d23b6b9b0568a50f5e796a0`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424614 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_off00003d12.bin` `ea4afbdc8b728a2c2e0bf857d8357eace3a2d271991b659b4d2eb24b7d875223`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D12	200 bytes

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