Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69b09f7c55c8687…

MALICIOUS

PDF

2.1 KB
MD5: 9b940b864ef101d6b65445ea55285bf0 SHA-1: 0aa60bf2fc994255baeeb3216c76f315d069e161 SHA-256: c69b09f7c55c8687d3e99e24553fa31d4b71e4a565acd0e9e77e1fde08bfabdc
194 Risk Score

Malware Insights

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

The PDF document contains the EICAR test string and instructions to click a link to save and launch it, indicating a social engineering attempt to deliver a malicious file. The embedded JavaScript and embedded file heuristics further support this, with ClamAV detecting the file as a dropper. The embedded EICAR test file itself is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-7301792-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7301792-0
  • 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.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
EICAR.txt
275a021bbfb6489e54d471899f7db9d1663fc695ec2fe2a2c4538aabf651fd0f		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x62C 68 bytes
Detection
ClamAV: Eicar-Test-Signature
Obfuscation or payload: unlikely
javascript_obj0008_000.js
c79586b6ce33258a4a3246f592054a0720afaa39e08ec5d2fa6c2c1d19c42b91		 pdf-javascript-stream PDF /JS object 8 at offset 0x4FF 58 bytes
javascript_obj0008_001.js
a99f0aad140b19a3f2f03812ca412c6d983fae48b9344738a95bf360fb8f644c		 pdf-javascript-stream PDF /JS object 8 at offset 0x4FF 56 bytes

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