PDF malware analysis — malicious · a43be8fdec4c5609

MALICIOUS

PDF

14.3 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)

MD5: 44ecf139450a9fe06b9a72a6e8128136 SHA-1: a423ad3f71e4641955e4a5e6cfd3250c9c8ad46b SHA-256: a43be8fdec4c5609c82e7d976cfc8a7ac59b14016f18e8ba88ca991cfe0d4ce4

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections (Pdf.Exploit.Agent-18026 and Win.Trojan.Agent-36166) confirm its malicious nature. The embedded JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to download and execute a secondary payload, a common technique for initial access.

Heuristics 4

ClamAV: Pdf.Exploit.Agent-18026 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-18026
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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_obj0007_000.js` `860e1c0656e5f61e8958f4c91d0967d4d9444a3f3b8aece3ad41b8b23b8c79ae`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74530 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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