PDF malware analysis — malicious · c43248e2af3a5c91

MALICIOUS

PDF

14.7 KB

MD5: c4fd70c7f6fa64240c52712e9eccd71a SHA-1: ada4b0fe7f150bb84d02cff32df4ee98ada94ede SHA-256: c43248e2af3a5c91b8080dcb6879f44700fb6f1cc838dafdc6b50d4e09af479b

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment

The file is identified as a malicious PDF by multiple high-confidence heuristics, including ML classification and ClamAV detections. The presence of an embedded script payload and XFA form suggests it is designed to exploit PDF vulnerabilities. The embedded artifact, 'embedded_pdf_script_00000329.bin', likely contains the exploit code, and the ClamAV detections 'Pdf.Exploit.Dropped-78' and 'Pdf.Exploit.Agent-36809' indicate it's a known exploit dropper.

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.
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.
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://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` `eca2a900a3100c1b081cd01783ebb4d98ba639c5cda8a7789ab4a664dc8f615a`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14275 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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