PDF malware analysis — malicious · f963b984588e7a87

MALICIOUS

PDF

118.7 KB

MD5: 977c8749e1accab765b9323513d0df96 SHA-1: 4460f191280146a1ef8e5022850f29ff2b3fe97b SHA-256: f963b984588e7a87bb44b95dbdcd79d2609f4ae9e19df9f9594d01cc0c8bb507

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains multiple embedded JavaScript streams, with a critical heuristic firing for a large comment-padded JavaScript eval stager. This indicates the script is designed to obfuscate and execute arbitrary code. The presence of 'eval()' and 'String.fromCharCode' further supports this, suggesting the script's primary purpose is to download and execute a second-stage payload. The ClamAV detection of 'Pdf.Exploit.Agent-36086' confirms its malicious nature.

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` `67befa1a5ff1d2c7247e197d01b1a8f61b788b1a7c92984c34b734d18d53e204`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627410 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` `03f6805974db595c79c0db8611dc1e5f8d5d5073fe39bb7de03f7f5ed14bfd51`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262118 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 690 long base64-like blob(s).

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