PDF malware analysis — malicious · f80e0345eebaa145

MALICIOUS

PDF

118.6 KB

MD5: a5266cb3c40d9f23cc87a4e14cbd3d06 SHA-1: 84c032350de888b33a8933d16653e66df6fc05ac SHA-256: f80e0345eebaa14536d41715bd2f37705e10787252b3cef4178b5a77cbe395d3

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a high-severity 'eval() call' and a 'Large comment-padded JavaScript eval stager'. ClamAV detected this file as 'Pdf.Exploit.Agent-36086', indicating it's a known exploit. The presence of JavaScript and the ClamAV signature strongly suggest the file is designed to exploit a vulnerability and execute malicious code, likely downloading further payloads.

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` `8fcb36e9d0279805990a29e3a215164599ee22b6ed1972c6b13a8dcb8fde951c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627333 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` `29c1cd625eda9c5669add7f3b0fcb83d3e5e7becf4b55aada445cddd6d06680c`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 606 long base64-like blob(s).

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