PDF malware analysis — malicious · 55a8cf9684f43968

MALICIOUS

PDF

104.7 KB

MD5: 6d26855db2977ad3087f791158190666 SHA-1: e257fb0d770e69b16eca5914e4cdaef39b18d2b0 SHA-256: 55a8cf9684f439686c4e7e4034afcb400ef9e8034e5b8059377acda1f84d398a

198 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded script payloads and utilizes XFA forms with executable scripts, indicating a malicious intent to exploit vulnerabilities. The presence of 'unescape()' calls and ASCIIHexDecode filters further suggests obfuscation techniques commonly used to hide malicious code. 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 artifact.

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` `230e86a9cd056c5ffbea7aa33165c4ceb8023783c5bcd6e69d7a513eaf17373d`	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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