PDF malware analysis — malicious · 177284d6c461c62f

MALICIOUS

PDF

18.3 KB

MD5: 593ca47de2a7c06ca23f687861bcbae5 SHA-1: 6aac177d52f649af8dd5268f4bc895ddad8ae6f7 SHA-256: 177284d6c461c62f2025153394f5878f4ddf12a66bab72d2d49ab44a29545365

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains an XFA form with embedded JavaScript, flagged by multiple heuristics as malicious and specifically detected by ClamAV as Pdf.Exploit.Dropped-78. The embedded script, although heavily obfuscated and truncated, is indicative of a downloader or exploit execution mechanism. The primary IOC is the embedded script file itself, which likely contains the malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Embedded script payload in PDF stream low 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 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://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_00000329.bin` `bc7b3ddb336238fdb45854b4ea37281866b6040caa87d1d6de12c3ad6fa48643`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	18008 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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