PDF malware analysis — malicious · c8d267d581e9bc97

MALICIOUS

PDF

104.7 KB

MD5: 783b97820cfb6398ec1b1c832d568919 SHA-1: 42b8933e83e675a282b5bba9cfaef9a4a7f18dfe SHA-256: c8d267d581e9bc9773e6a61933d8accbe0ce8ceb1f1be215aa2bfa45e3c4494b

198 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded script payloads and uses XFA forms with executable scripts, indicating an attempt to exploit vulnerabilities. The presence of `unescape()` calls and ASCIIHexDecode filters further suggests obfuscation and exploit delivery. ClamAV detection as 'Pdf.Exploit.Dropped-78' confirms its malicious nature. The embedded file 'embedded_file_obj0008.bin' is likely the delivered payload.

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` `16fa3d1c24d6a124848949d36efcf0590e5415532aea7547ef8c827aea81b706`	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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