PDF malware analysis — malicious · fbbc9afcae69c0d9

MALICIOUS

PDF

118.7 KB

MD5: 6831dad2d709fbc1d0f1a471903ae1ca SHA-1: ef87514a0b8d70be10bfbaadd065ef5a27d71bad SHA-256: fbbc9afcae69c0d9b28ea619cd2de81d52d0e16d6e984676ebba9d7dd37b3986

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains multiple JavaScript streams, including one with a large comment-padded eval stager. The ClamAV heuristic also flags it as 'Pdf.Exploit.Agent-36086'. The presence of eval() and fromCharCode indicates obfuscated JavaScript, likely used to download and execute a secondary payload. The document body was unreadable, but the heuristics strongly suggest exploit activity.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `2c3d88ee4ac0bfeddd62ca239b9bb522e8ff218b7341a966b4abe21e6ceb16fd`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627903 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).
`legacy_pdfkit_stage_000.js` `e317e6348c828a68ea5ba84cbbcdc560309e0d68e0e53d0f4a8586823ddff6ae`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 515 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `b940d329b0c78814f66a5a3b5c5f36d11f4da3f7fd8289a39f5d7b5c20bae64a`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 638 long base64-like blob(s).

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