PDF malware analysis — malicious · 3c2a0896aef2428e

MALICIOUS

PDF

104.7 KB

MD5: 3409b78f156861f88087f08168726e3c SHA-1: cd3d193e7f75e714a3e39efa0dcb137326b198b5 SHA-256: 3c2a0896aef2428e9e7d9c3ee971d5ab6cc491fa3005aceeccb947b4751ff4e9

228 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged as malicious by multiple heuristics, including PDF_UNESCAPE and PDF_XFA_SCRIPT, indicating the presence of obfuscated and executable script content within an XFA form. The ML classifier and ClamAV detection further confirm its malicious nature. An embedded file, 'embedded_file_obj0008.bin', was also extracted, suggesting it acts as a dropper for a secondary 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` `71d6353d7c3c52c535ebd9506c3537161c2c63cd85460e974da82fd3f27e527d`	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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