PDF malware analysis — malicious · d639668496466dcc

MALICIOUS

PDF

103.1 KB

MD5: 6f071af2f6a8809309dbb35c6636944c SHA-1: f26e3b57fbe8df24c6ce70ab75e7753ed76df729 SHA-256: d639668496466dcc51b3766264ce19fe3f2bacbec6d42960ec61e1bc158d97db

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains XFA forms and exhibits high-risk script execution, indicated by PDF_XFA_SCRIPT and PDF_UNESCAPE heuristics. An embedded file, 'embedded_file_obj0008.bin', was also extracted, suggesting a multi-stage attack. The script likely attempts to download and execute a second-stage payload, contributing to the malicious verdict.

Heuristics 7

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.
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` `ce282a88fced1f0476fd2078fe4a4d4163ad5341c2445b31b6eb0d0fb2ad8b83`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	14974 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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