PDF malware analysis — malicious · b9aed74ac02dfc6d

MALICIOUS

PDF

15.7 KB

MD5: 3cb442e50f723e8d577febbf9728158a SHA-1: a357b2951d1b4a0e5ca005c36415cb6da1ed6c81 SHA-256: b9aed74ac02dfc6d513a0db146ae3b01eef6bbd0954bf8c55ad428efd6accdf9

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains obfuscated JavaScript, including a large comment-padded eval stager, which is a common technique for delivering malicious payloads. The presence of `eval()` and `String.fromCharCode` indicates code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' further supports its malicious nature. The primary attack pattern involves exploiting the PDF format to run arbitrary code, likely for downloading further malware.

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` `85c9859633932ef68beff3a0ac5bc4eb65afe25b0a55fe1d3933fa662a20362a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425894 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` `555796690110a236b881a3aceafa3d86ad3f9823b9cb56d40ae02d7cadf71db6`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 612 long base64-like blob(s).

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