PDF malware analysis — malicious · b26437c79672bd8b

MALICIOUS

PDF

10.4 KB

MD5: e421967ffda06be6cf7eeb4a59cb4dbc SHA-1: dcdb527ed838e75e97d6a8e7640caa83d324812a SHA-256: b26437c79672bd8b49332b3310d6981830ed672de3c11252351a31a26cc342b3

110 Risk Score

Malware Insights

MITRE ATT&CK

T1566.003 Phishing: Exploiting Trust in Email T1204.002 Malicious File: User Execution: Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for obfuscated objects and an ML classifier indicating high maliciousness. The presence of an embedded file further supports the malicious nature. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide malicious content. The primary attack vector appears to be exploiting a PDF vulnerability to deliver a secondary payload, as indicated by the embedded file.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

Heuristics 4

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0001.bin` `ec825329b13a4ec19215bfce5cb2fc11110678de50792e62403b914ec7c97740`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x80	13408 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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