PDF malware analysis — malicious · 820a63e8fac449db

MALICIOUS

PDF

37.3 KB Created: 2010-02-25 01:39:41 +03:00 Authoring application: TCPDF (via TCPDF 4.8.032 (http://www.tcpdf.org))

MD5: caa0d12d3d61f28937ca287badae48fa SHA-1: b2c19228ebd39649265b3bc41fd19b717f69fb53 SHA-256: 820a63e8fac449db866b67d4f9de7cb174ba0321e937034df015860a818cfe57

114 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV also detected it as Pdf.Exploit.Agent-13861. The JavaScript is obfuscated but its presence and the ML/heuristic detections indicate it is likely used to exploit a vulnerability and download a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Pdf.Exploit.Agent-13861 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-13861
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.
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0010_000.js` `fa491f71784e0a73cdf526093b5813859d148d9fd37068741f429f4758644d96`	pdf-javascript-stream	PDF /JS object 10 at offset 0x7063	8126 bytes

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