PDF malware analysis — malicious · aa18f1426a026b51

MALICIOUS

PDF

80.8 KB

MD5: f977542d61a0403807f123f0c2169237 SHA-1: b615492e19101eba8547d40a1a8d6832520ed7e9 SHA-256: aa18f1426a026b5151fcbba84f34e7bad8d8f94ac922b8a4a02891436720b572

186 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious File T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file was flagged as malicious by multiple engines, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-93'. The heuristics indicate the presence of an embedded script payload within a PDF stream, suggesting an exploit designed to download and execute a secondary malicious artifact. The ML classifier also strongly indicated maliciousness. No specific family could be identified, but the attack pattern is consistent with a PDF-based exploit dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

ClamAV: Pdf.Exploit.Dropped-93 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-93
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.
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_00000372.bin` `5649fbe8cfaaeb1ce33dfa1a8bdf5c4f356205690c044aa13ad356c25c647fae`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x372	69673 bytes
Detection ClamAV: Pdf.Exploit.Dropped-93 Obfuscation or payload: unlikely

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