PDF malware analysis — malicious · a3dc6e21302d02bc

MALICIOUS

PDF

15.7 KB

MD5: 0652f61fff2f8e9c8281643d2da62603 SHA-1: 494c512e247a833c3f2239e65f24e01a09f526be SHA-256: a3dc6e21302d02bc9723601a36fadfb3cd9f4f5e0cd17423afa00ef8bb5ae3ce

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating an attempt to obfuscate malicious code. The critical ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is a known exploit. The primary function of the embedded JavaScript appears to be the execution of a secondary payload, as indicated by the 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' heuristic. The document body was unreadable, but the presence of JavaScript and the exploit detection are sufficient to infer malicious intent.

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` `de4c7a5c26373cd297a5747dd8efff83efde5c50edf87d99a7fe2707cef89c3e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424746 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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