PDF malware analysis — malicious · 3cc5990fe2196614

MALICIOUS

PDF

118.6 KB

MD5: 65ffdd1d3aa84b81f11c6be766f44299 SHA-1: aa98a760660a4ee2e8cd27e510b3f576e541d45c SHA-256: 3cc5990fe219661489cd0aa6557e55db0f23746b741d32125cf902e0390b1719

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, with high-confidence heuristics indicating the use of eval() and a large comment-padded JavaScript eval stager. This suggests the script is designed to deobfuscate and execute malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature, pointing towards an exploit targeting PDF vulnerabilities to deliver a 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `6e1dd63d0805afea75b6b018b3eade4d3f54ec252d773f3a156d530ce7b5e111`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626918 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).
`stream_001_off0001d6f7.bin` `16ab67ba67d8b396b328906b6b133bdef81a46f7bf498441418a5f1f24a5f5dd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6F7	300 bytes
`legacy_pdfkit_stage_000.js` `d156b9360f7bf2d58dd2aa76fb2520780752a10367f518f26cb3ab841168b134`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 596 long base64-like blob(s).

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