PDF malware analysis — malicious · b4a3b95ef04218da

MALICIOUS

PDF

103.1 KB

MD5: 72b0173c471072bed53a405eab6ddae9 SHA-1: ef7da5b3d98869baa7a48050d3f0faad6317909d SHA-256: b4a3b95ef04218da334e70dd2fe08fa0a199ccfb1b3cfa36d94bd2bd67b12972

138 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious Attachment T1059.007 Command and Scripting Interpreter: JavaScript

The PDF file contains heuristics indicating it uses XFA forms with risky executable scripts and embedded files. The 'PDF_XFA_SCRIPT' and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' firings suggest the XFA form is designed to execute malicious code. An embedded file, 'embedded_file_obj0008.bin', was also extracted, likely serving as the secondary payload. The 'unescape()' call and 'ASCIIHexDecode' filter further indicate obfuscation and potential exploit delivery.

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` `437b13f2e18f662c3ddec813283a97733c5f25766927008f6d181831f5d0a74d`	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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