PDF malware analysis — malicious · e1883d5e33cb5574

MALICIOUS

PDF

15.7 KB

MD5: b2cf33ac7f6c8aa4439d1021817739e0 SHA-1: a96a439bd66ee785e3e5f42e28ecc9c426f48ba5 SHA-256: e1883d5e33cb5574a1200fa694b6e0608d3710084a15d282b0a7ee947bc4dc57

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1204 User Execution

The critical ClamAV detection and high-severity heuristics for PDF JavaScript execution, including eval() and a large comment-padded stager, strongly indicate a malicious PDF. The embedded JavaScript stream, identified as 'javascript_obj0006_000.js', is the primary mechanism for exploitation. While the exact payload is not visible, the pattern suggests it downloads and executes a second-stage payload, consistent with common PDF-based malware delivery.

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` `a70d3173dda1023931b551475a7d3344296411b95e9bf9e4c270d3ba8d29c17f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425067 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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