PDF malware analysis — malicious · cdc57a218a6127ca

MALICIOUS

PDF

103.8 KB

MD5: 4ad4ce2e4f95df7fc21f97c1c21c8fdf SHA-1: 3dc7503ac00f4fe0f680823dc0c0cd158185bf46 SHA-256: cdc57a218a6127ca39a08452748bf5f8e8d3108498840e5450cfc643b76adbe1

198 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded script content and utilizes XFA forms with risky executable scripts, indicating an attempt to exploit PDF vulnerabilities. The presence of `unescape()` calls and ASCIIHexDecode filters further suggests obfuscation and potential exploit delivery. ClamAV detection as 'Pdf.Exploit.Dropped-78' confirms its malicious nature. The embedded file 'embedded_file_obj0008.bin' is likely the dropped 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` `6e4754db1df6502b8c3943940cd1a6c03123b1958576e7054a1fd55bac990473`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15083 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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