PDF malware analysis — malicious · 3d824c452e62dd83

MALICIOUS

PDF

118.4 KB

MD5: 947303b36f62aa0a3985267eb597c4f9 SHA-1: 51a1a0ff97a9a35a3f954f5f4c23f55f2e81695e SHA-256: 3d824c452e62dd83107fa89949b4ff5ce8cc82ea1641d58cc5c46f034172e191

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. A high-confidence PDF_EVAL heuristic and a PDF_JS_LARGE_COMMENT_PADDED_EVAL firing suggest the JavaScript is designed to execute arbitrary code, likely to download and run a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-36086' further supports this. No document body text was available for analysis, but the presence of obfuscated JavaScript points to a 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` `d0378a93d1715834bd9019b120330a1e858c9af94ab692d0176cd4c5d1b9a8ba`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626383 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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