Malicious PDF — malware analysis report

Static analysis result for SHA-256 5296bbb38321e85d…

MALICIOUS

PDF

2.1 KB
MD5: 9e48e078caaf481d91f097c311e2462e SHA-1: f81f48a4d4ff3ae0be9608da8ec8edfcbbcc1f3b SHA-256: 5296bbb38321e85dfb288f091ec3411b73bce98bee3a14bebb610011767199fd
194 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1553.005 Mark-of-the-Web Bypass

This PDF document embeds the EICAR anti-virus test file, which is a standard method for testing antivirus software. The document body prompts the user to click to save and launch the embedded EICAR.txt file, indicating a social engineering attack. The embedded JavaScript streams and obfuscated PDF structures further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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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