PDF malware analysis — malicious · 92ccdcbbc02f7cfc

MALICIOUS

PDF

105.6 KB

MD5: bf7886134a3232dec33c8af8232c164f SHA-1: 8aecb1a3875f78551df7f184927c96dd0ac6e1ac SHA-256: 92ccdcbbc02f7cfc10cfee6f727af05012438dda5c12c6157fe988fed45a5738

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment T1027 Obfuscated Files or Information T1059.001 PowerShell

The PDF contains multiple high-severity heuristic firings indicating embedded scripts and potential exploitation via XFA forms and ASCIIHexDecode filters. The ML classifier strongly flags this PDF as malicious. An embedded file, 'embedded_file_obj0008.bin', was also extracted, suggesting it is part of the malicious payload delivery mechanism. The exact script content is not detailed, but the presence of obfuscation and embedded payloads points to a downloader or exploit loader.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
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` `526a7fae348fcebfb5769d8e43473dba58097031e78ebff4abd8c6051898f5b7`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15346 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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