PDF malware analysis — malicious · 0756357671e338ef

MALICIOUS

PDF

39.4 KB Created: 2009-10-14 21:52:11 +04:00 Authoring application: overMore (via 18c41d036d6bc0a2715563dbbc56b94a)

MD5: 8cb237784ac3578c28f3a4f71609cf6e SHA-1: c5bd5a2162f56be0a3a78c142e17ebc432f2ff09 SHA-256: 0756357671e338ef2d11b862789e8ade326b87a032da58fb6b9a3399fbd9ce36

114 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical ClamAV detection and high ML score indicate malicious intent. The embedded JavaScript, identified by PDF_JAVASCRIPT and PDF_JS heuristics, is the primary mechanism for exploitation. This script likely acts as a downloader for further malicious content, aligning with the 'Pdf.Dropper.Agent-7225171-0' classification. The document's purpose is to exploit a client execution vulnerability via a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7225171-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7225171-0
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0024_000.js` `64d6a217bd0a4a00d9c9e86b6f5b4d8ffb89fa3b9626b9d5f2863a65c5b91231`	pdf-javascript-stream	PDF /JS object 24 at offset 0x41BB	21376 bytes
`stream_007_off000041bb.bin` `5b059b9e3ceb343555487374c4b280c051cdb4f68f6a162a29b534c22f3ccc38`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x41BB	10687 bytes

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