PDF malware analysis — malicious · c4eb7ce044a2f589

MALICIOUS

PDF

9.3 KB

MD5: d34e495ff4ac8e7ac60dc8ff644e69e3 SHA-1: f7305db913a80d1e607bd8093f7d92bf55b6409f SHA-256: c4eb7ce044a2f58997cf458da73ede6b2f49df2bf5636c68b56503e0264016b8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA_SCRIPT heuristics. The ML classifier strongly flags this PDF as malicious. The deobfuscated.js artifact suggests the script is designed to download and execute a second-stage payload. The presence of eval() and String.fromCharCode calls further supports the malicious intent.

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0041.bin` `47e6ab2a7d3f7a196ccc4fcd24a67d8f49000664bffb128ea6260e50a52869e7`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1164 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `f469f4fbbd302eabc190872c5c668bb339fb1f363ed73b17ffe8c0097cb2c27f`	deobfuscated-js	PDF JavaScript deobfuscation pass	1904 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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