PDF malware analysis — malicious · f314e4cbfd06131e

MALICIOUS

PDF

104.7 KB

MD5: 182755636f20a253e350032626bdb07b SHA-1: 75075c3bc88ddbf9efd17ceafc797c072795b7ee SHA-256: f314e4cbfd06131eb938679d38a8dadb9119696c6b2e701989148303486d9d17

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded objects and risky executable scripts within its XFA forms, indicated by multiple high-severity heuristic firings including PDF_XFA_SCRIPT and ML_NYX_PDF_MALICIOUS. The presence of an embedded file object (embedded_file_obj0008.bin) and the PDF_UNESCAPE heuristic suggest that the document is designed to deobfuscate and execute malicious JavaScript. This script likely acts as a downloader for a second-stage payload, contributing to the overall malicious nature of the document.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `5c01139a22d75d7181efbaa525a1cfaad724165ddc0bd4bfb1e57150da5b3854`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15214 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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