PDF malware analysis — malicious · e5f80f5021b33f08

MALICIOUS

PDF

2.1 KB

MD5: 6ad445b65d49cfca332805f1f40dc738 SHA-1: 15decaca6172911dad06e48aa6385a3e4114967a SHA-256: e5f80f5021b33f08202e7f15fbd2f1e77d839690356c994c05592351545a6e31

194 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File Execution T1204.002 Malicious File Execution: User Execution T1553.005 Subversion: Mark-of-the-Web Bypass

This PDF document is designed to deliver the EICAR test file, a standard anti-virus detection artifact. The document body explicitly instructs the user to click to save and launch the embedded EICAR.txt file. The presence of embedded JavaScript and the ML classifier's high confidence score further indicate malicious intent, likely to trigger an anti-virus alert or test security controls.

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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