Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2664abc912537fc…

MALICIOUS

PDF

43.8 KB
MD5: 2f1952dc58e69e11fe1f6698f5dd7610 SHA-1: 122aec602458dc0a9cddff81c82eb2b3945b08e7 SHA-256: d2664abc912537fc8ee13f8334c6529fe21a2049965fea5629228712917599d0
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. ClamAV also detected this file as 'Pdf.Exploit.Agent-36307'. The embedded JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to execute arbitrary code. The document body content is heavily obfuscated and does not provide clear user-facing text, but the presence of exploit-related heuristics and the ClamAV detection strongly suggest malicious intent, likely involving the execution of a second-stage payload.

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36307 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36307
  • 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.

FilenameKindSourceSize
javascript_obj0008_000.js
20e1f1bc0581926b1b80258a7552a0dd3056c520d66883e5d4d62f2cfd52c7e1		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 3193 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36307
Obfuscation or payload: unlikely

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