PDF malware analysis — malicious · 64f7055e2acd715a

MALICIOUS

PDF

12.5 KB

MD5: 55508627ad4f8f82c07d96d01dcaeac3 SHA-1: 882bede74e4e2677830dc5b1bb8060404cc41084 SHA-256: 64f7055e2acd715ae235fafe908d38f4939129bbc42fad218afc3b7a6350f7b2

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, identified by multiple heuristics as a stager for decoding and executing malicious content. The JavaScript function `test2` appears to decode a string from the `cc` object, which is then evaluated by `eval(s)`. This suggests the script's primary purpose is to download and execute a second-stage payload. The ClamAV detection name further supports its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `24960ee685b019908931d405f5be7a3cf4b3e57dbc4afc6ce8944eff10727ed0`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2FCB	331 bytes

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