PDF malware analysis — malicious · eaa5b7af7d365454

MALICIOUS

PDF

15.7 KB

MD5: 59266f4cb21a647954d251bb17915c8e SHA-1: 38ab3e0d55354ef0f3fbc80232acc71eb19c0d4b SHA-256: eaa5b7af7d365454b791a2359ee47241bc22f71ae0b31f3acf1a6c750a802849

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, with multiple heuristics indicating JavaScript execution and obfuscation. Specifically, the 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' and 'PDF_EVAL' firings suggest a stager designed to decode and execute malicious JavaScript. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature, likely involving an exploit within the PDF structure to achieve code execution. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

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` `5265cd5739298f42bd62a66abeeeabe24013ef5944a61f2441d2768a7ec0e4ba`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425197 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).

Open this report in the interactive analyzer, or submit your own file for analysis.