PDF malware analysis — malicious · b280dec46a3fdff8

MALICIOUS

PDF

2.1 KB

MD5: 922683d87d09db32ba154f67f9fc9b91 SHA-1: 0638f66eaaa07f7e9c521fc7f516784cbfa23dfa SHA-256: b280dec46a3fdff8eadf8ca1878013b66556cc15bb2fe949e9197b9aeacd71fd

194 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1553.005 Mark-of-the-Web Bypass

The PDF document explicitly contains the EICAR test file, as indicated by the document body and the ClamAV detection on an extracted artifact. The embedded JavaScript and PDF obfuscation techniques suggest an attempt to disguise the malicious nature of the file and potentially execute further actions, though the primary payload is the EICAR test file itself. The ML classifier also strongly flagged this PDF as malicious.

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.

Filename	Kind	Source	Size
`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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