Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f0eac0b8090533…

MALICIOUS

PDF

81.9 KB Created: 2010-03-17 12:45:11 +01:00
MD5: 45416b2b997ae2acbc35f8244e68f87d SHA-1: f820e6dcdf153c6de26a265b9eb52748450b9d74 SHA-256: e8f0eac0b8090533eb4b8e388a3282a4898c9f1a43d8e2cea48e4bde8c598f15
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded artifact that is detected by ClamAV as 'Win.Trojan.Java-6'. The PDF itself is structured as a lure, containing images but no readable text, and the 'PDF_EMBEDDED' heuristic confirms the presence of an external file. This indicates the primary attack vector is likely the embedded malicious Java payload.

Heuristics 4

  • ClamAV: Win.Trojan.Java-6 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Java-6
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
Java.ClassLoader.24564.jar.bz2.jar.bz2.jar.bz2
26a7231bafa14af4d723b055b02c7da08c7aa38233bf1fb32190f8946902179b		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x1052F 16357 bytes
Detection
ClamAV: Win.Trojan.Java-6
Obfuscation or payload: unlikely

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