PDF malware analysis — malicious · 7cc5b99fefc959c7

MALICIOUS

PDF

118.6 KB

MD5: d9785f8e6d7e53627238c5cff8d5638e SHA-1: 289e3f41e92bae919a92d408c45a09fa4ef29fa5 SHA-256: 7cc5b99fefc959c7752f4eee9ccc719f6b0064feca3fc5f3580548a8fe6c0d1d

196 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, including a call to eval() and a large, comment-padded eval stager. This indicates the script is designed to execute arbitrary code. ClamAV detected this file as 'Pdf.Exploit.Agent-36086', strongly suggesting it's a malicious exploit. The ML classifier also flagged it with high confidence. The primary attack pattern involves exploiting PDF vulnerabilities to run obfuscated JavaScript, likely for downloading and executing a secondary payload.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `7b8ac1c0443cfb67dfb15b9c16b779a69042043e71d0e7e2e59cd447d4708e70`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627458 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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