PDF malware analysis — malicious · 61ffe2fb7ec82785

MALICIOUS

PDF

18.3 KB

MD5: 88de5663b68ee830ab725a9bd767b5b5 SHA-1: ab8fe973c13abe49982ab5782e8870ab8d2a80e5 SHA-256: 61ffe2fb7ec82785126a56d7a5d777cb7990d10f6378e117052002dd807ef3fa

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. The presence of an XFA form and embedded JavaScript suggests an exploit targeting PDF viewers. The embedded script likely attempts to download and execute a second-stage payload, as indicated by the ClamAV detection on an extracted artifact.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-36789 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36789
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_00000325.bin` `4796057eb454709ddea2fe89dac072140a6b847dd500a11dd09e1472fef7b075`	pdf-embedded-script	PDF raw stream script payload at offset 0x325	18038 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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