PDF malware analysis — malicious · 368be116914acf0e

MALICIOUS

PDF

15.7 KB

MD5: cfbb7268d315c4a1333bcedb44131488 SHA-1: bbe4025e23df5817892e9b6da291993df6c9b092 SHA-256: 368be116914acf0ee0b2e90348e54353cf95c1fc13b3b46211685dcb16957775

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, as indicated by multiple PDF-specific heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' heuristic suggests a stager designed to obfuscate its malicious intent. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests this is a malicious exploit document. The embedded JavaScript likely acts as a downloader for further malicious content.

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` `828655c90e9f3bdc38a7fa6c75ec1ec2ea1603f4ac173718c6f76d9f14ec3fa3`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425799 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).
`stream_002_off00003d30.bin` `37d6cb2185c03be8cf3839471f05024817b841bb9780e9b953b279d47a0d91cf`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D30	200 bytes

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