Malicious PDF — malware analysis report

Static analysis result for SHA-256 418ab0fc3567c9be…

MALICIOUS

PDF

48.1 KB
MD5: ca98dbfa77928e5fc79a208dfebfdc5b SHA-1: 9dfce5fab19870acaf5da1d49d123236f12f9ee9 SHA-256: 418ab0fc3567c9bed96d1fe71fcbb394d6434cec35fc7ab86a37fcc31bec742b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a RichMedia (Flash) object, indicating an attempt to exploit vulnerabilities. The ClamAV detection 'Pdf.Exploit.Agent-35955' strongly suggests malicious intent. The embedded JavaScript and SWF file are likely components of a multi-stage attack, where the JavaScript is used to load and execute the Flash content, which in turn may download and execute further payloads.

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
WpuVlEGnF.swf
bf9dea6ff47dfb47c2f51b1fa9a09527dfe5e95399ccb2d043ba956b197360c9		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x5632 52647 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: unlikely
javascript_obj0006_000.js
adddc6330c1fade3051c55a3e6d184f626d547a717e6ef8569bd3481d61d86ae		 pdf-javascript-stream PDF /JS object 6 at offset 0x13E 6478 bytes

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