PDF malware analysis — malicious · f588f01e51780a27

MALICIOUS

PDF

104.7 KB

MD5: 9429825ac81a480bf6ad5caf751f7014 SHA-1: a86f37191e4d0b2793034787f649e21de99ee04f SHA-256: f588f01e51780a27e6ec5d78c3c4d3a22d04351f51e72fe6d731c0c4b3b72be7

198 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file exhibits multiple high and critical heuristic firings related to embedded scripts, XFA forms, and obfuscation, indicating malicious intent. ClamAV detection confirms this, identifying it as Pdf.Exploit.Dropped-78. The presence of an embedded script payload and the use of PDF_UNESCAPE and PDF_FILTER_HEX suggest the file is designed to exploit vulnerabilities and likely download a second-stage 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` `28e60cd044c75f46f73bb13d3d205517d304354174dc810f4038d58832c43189`	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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