PDF malware analysis — malicious · 313f8e7cb1de1686

MALICIOUS

PDF

14.7 KB

MD5: 79956597d6f28946e10503585a4b0d45 SHA-1: 7c1211e12d012dd6cbf41b5e41a50170444d0b26 SHA-256: 313f8e7cb1de168681106c1b2bc7620997c11b13102c50e6366fe023e2f4d18b

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file utilizes XFA forms, a known vector for exploitation. A critical heuristic indicates an embedded script payload within a PDF stream, and ClamAV detections confirm it as a malicious exploit dropper. The embedded artifact is also detected by ClamAV as a malicious agent. The primary attack pattern involves leveraging the XFA form to execute an embedded script, likely to download and run a second-stage payload.

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` `361f1235cc8f1c6dd837814635d0d167117831ac26f1baae373b574f44ae0d6e`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14291 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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