PDF malware analysis — malicious · 59c81b3a8beca26c

MALICIOUS

PDF

118.6 KB

MD5: 7e0963aa96697f13427445fc9545057f SHA-1: 606e988668aaed85340c886676c03b9051f45c34 SHA-256: 59c81b3a8beca26c6ade5659f21c1bd508e7bc001980658f52779c0a13dbfbdc

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript that utilizes `eval()` and `String.fromCharCode` functions, indicating an attempt to obfuscate and execute malicious code. The presence of a 'Large comment-padded JavaScript eval stager' heuristic firing further supports this. ClamAV also detected this file as 'Pdf.Exploit.Agent-36086'. The primary attack vector appears to be the exploitation of PDF vulnerabilities to run arbitrary JavaScript, which is then used to download and execute 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `62625c2cb7ce4cf60ca421bf37c3bbbf58687147203fab58ceaa675c314e305d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627875 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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