PDF malware analysis — malicious · 51e6e64ee66e3e0c

MALICIOUS

PDF

118.5 KB

MD5: bc70d31a175fa02b721646a855e7c1e2 SHA-1: 68fe57f2b17c371f1f83b0f163d57247050b1e65 SHA-256: 51e6e64ee66e3e0c685039ae791a10260b20331ab7e5009fa41bbfa721a38d23

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript T1566.002 Spearphishing Attachment

The critical ClamAV detection 'Pdf.Exploit.Agent-36086' and multiple high-severity heuristics (PDF_EVAL, PDF_JS_LARGE_COMMENT_PADDED_EVAL) indicate this PDF is designed to exploit vulnerabilities. The embedded JavaScript, specifically the large comment-padded eval stager, strongly suggests it's intended to download and execute a secondary payload. The file type and exploit indicators point towards a malicious PDF designed for exploitation.

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` `d9d932ecb80365b98333fe02b3d62f6bcbbebbdf67e8ff2316f9158728aab299`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626831 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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