PDF malware analysis — malicious · 74a238457ce49942

MALICIOUS

PDF

37.8 KB Created: 2010-04-11 08:39:55 +04:00 Authoring application: TCPDF (via TCPDF 4.8.032 (http://www.tcpdf.org))

MD5: 62f14a6094914e430f69ca55e65af595 SHA-1: 6d0b7cc5db53230b18df9f4260c608eaae0abc2a SHA-256: 74a238457ce499422216c1e5f0f517100983ef9e8fa3fd1e23c96482bd7eac7a

114 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Exploit.Agent-22556. The embedded JavaScript, after deobfuscation, appears to construct a dynamic URL for a second-stage download and execution. The script uses a setTimeout function to execute the constructed URL, indicating a payload delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Pdf.Exploit.Agent-22556 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-22556
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` `4981f09a2ed0074e845519edb75e8350700a9a7f77d481645f8a9856afe8a92f`	pdf-javascript-stream	PDF /JS object 10 at offset 0x8CEF	1346 bytes

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