PDF malware analysis — malicious · 8536026f9a4e5627

MALICIOUS

PDF

104.7 KB

MD5: dd803d0abb84fdc974487cb334df5255 SHA-1: c86a67719cb6c0664f152a62a5b581ce1b428f4d SHA-256: 8536026f9a4e5627ea8d6317641c4b321d8496546bddafde7563ba44fbf49ae2

228 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter T1071 Application Layer Protocol

This PDF file was flagged as malicious by ClamAV (Pdf.Exploit.Dropped-78) and a machine learning classifier. Heuristics indicate the presence of XFA forms, embedded files, and unescapable/hex-encoded streams, suggesting an exploit attempt. The embedded file 'embedded_file_obj0008.bin' is likely the delivered payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `ce7c8ea1e7f1e4669bf5434273f421db0970e3bba9cf675afc0d8fbeee20e685`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15203 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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