PDF malware analysis — malicious · fdc6d57a5b19e2d2

MALICIOUS

PDF

104.8 KB

MD5: 89a472c3c56627f49e9144d4be85492c SHA-1: e086a402fe137d5ef440173fb3711f974254aba6 SHA-256: fdc6d57a5b19e2d23b6cf514c421284e6a3fbf1230637d1985c2790578c5384f

198 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter T1071 Application Layer Protocol

The PDF contains embedded objects and uses XFA forms with executable scripts, indicating an attempt to exploit vulnerabilities. The presence of `unescape()` calls and ASCIIHexDecode filters further suggests malicious intent. ClamAV detection as 'Pdf.Exploit.Dropped-78' confirms its malicious nature, likely involving the download and execution of a second-stage payload from the embedded file.

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` `4645950777179cbe740cb5ebb75bc5f1b165c0c14810faef404ffcb8f426461a`	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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