PDF malware analysis — malicious · 9a00649a641b75d4

MALICIOUS

PDF

118.5 KB

MD5: 9bee681f691583111d4dd2c1c1d7d064 SHA-1: 107d3e52b12503529625905a4710b73593a69dfd SHA-256: 9a00649a641b75d45d1377da751440f3de135df8a851e7f40f2b1bfdf3cc5ce1

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, which is heavily obfuscated and uses `eval()` and `String.fromCharCode()`. Heuristics indicate a large comment-padded JavaScript eval stager, suggesting it's designed to deobfuscate and execute malicious code. ClamAV detection confirms this as a known exploit, likely Pdf.Exploit.Agent-36086. The primary attack pattern involves exploiting PDF vulnerabilities to run this script, which is typical for downloading and executing further stages of malware.

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` `693f9a770772a66312a6047a20560c189bbf8a43e7a72351b4e78de6cfc7dcd3`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626978 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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