PDF malware analysis — malicious · 3338eaef0b624c9f

MALICIOUS

PDF

15.7 KB

MD5: 08e6e00aa70a779175faae50fe84a524 SHA-1: 1f4469a8e438440bfba958a6a6dc622a5698ecce SHA-256: 3338eaef0b624c9f0b3a7e2729e69262b045b19008cb6fe926ccd47462e79f0d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large comment-padded eval stager, which is a common technique for obfuscating malicious code. The presence of `eval()` and `String.fromCharCode` further indicates code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests this PDF is designed to exploit vulnerabilities and 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `7700cb086496ae49338ffd56bcc90770f43842ae3e75442cef73069dc042a1bf`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425525 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` `68b56cc58b6bbd5379767e476a9d72156859a0e64210fd2135a21aadedad4771`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262090 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 642 long base64-like blob(s).

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