Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f01d21b2669897…

MALICIOUS

PDF

31.7 KB
MD5: 7e16ab97d30963c20bc525d5d4f34f13 SHA-1: ff0078099745798b5ca3740fa09ef0b502e369a7 SHA-256: a8f01d21b2669897d2cfad99b648bafb99468c8af9918a76030669ce3c637bb1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.003 Phishing: Exploiting Trust in Web Mail T1204.002 Malicious File: Malicious Attachment

The file is a PDF containing embedded JavaScript and a Flash object (SWF). Heuristics indicate PDF JavaScript actions, embedded JS streams, and RichMedia (Flash) exploitation. ClamAV detected this as 'Pdf.Exploit.Agent-35955', and an extracted artifact named 'QtUQQCmQSHON.swf' was also flagged by ClamAV. The presence of these elements strongly suggests the PDF is designed to exploit vulnerabilities, likely to download and execute a second-stage payload via the embedded Flash content.

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
QtUQQCmQSHON.swf
c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x14D8 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
a3f725ad8ecf7801a8a9f4f1577068eee1d236a9929da0b934b2c42f586744bc		 pdf-javascript-stream PDF /JS object 6 at offset 0x146 3588 bytes

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