PDF malware analysis — malicious · 8d40328cb5d7c63d

MALICIOUS

PDF

104.8 KB

MD5: 048fd08866fbda47d7bcacbeeeea2354 SHA-1: 37acf4ac6a70894ee33db1c594e7dbdb758596cc SHA-256: 8d40328cb5d7c63de964976b46c4644af202d59d4a6551e13411c5261255c1da

228 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged as malicious by ClamAV with the signature 'Pdf.Exploit.Dropped-78'. High-severity heuristics indicate the presence of an embedded script payload and the use of unescape() and ASCIIHexDecode filters, suggesting obfuscation and exploit delivery. The ML classifier also strongly indicated maliciousness. The file contains an embedded artifact, likely the second-stage 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` `73e090b89425d6a8c7c959694934e81f43a88123be2d8f9e95da9462baf9b9b0`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15227 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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