Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a2064fe2f8d4b7…

MALICIOUS

PDF

32.5 KB
MD5: 9cc4572593ef37868295d8160dc84986 SHA-1: 5b5e649e361c38c9a05f6d645effca0303021673 SHA-256: 82a2064fe2f8d4b72a7349c5a173b76e8ba8f0b4770ecc46fc2c1c630be60b98
186 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and RichMedia (Flash) content, as indicated by multiple heuristic firings. ClamAV detections confirm its malicious nature, specifically identifying it as 'Pdf.Exploit.Agent-35955'. The embedded Flash file 'dtAdxrAvBG.swf' and the JavaScript stream are the primary vectors for exploitation, likely used to download and execute a second-stage payload.

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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
dtAdxrAvBG.swf
c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x17DC 26774 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35955
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
javascript_obj0006_000.js
07005c753dba74accbbaf55b516c19cc9046941107ff2942a6dea9eea7fc95b9		 pdf-javascript-stream PDF /JS object 6 at offset 0x140 4307 bytes

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