PDF malware analysis — malicious · ebd93b501dab1e27

MALICIOUS

PDF

9.5 KB

MD5: df0256639ac66523b46e6e66607ed724 SHA-1: ac1f27cc9d2e18503741474709db394ff0c67cec SHA-256: ebd93b501dab1e27e6ec394f1cb3249ad3ba52c5dfafc2df7c48139c0486b389

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, indicated by the PDF_EVAL and PDF_XFA_SCRIPT heuristics. This script, found in 'deobfuscated.js', is designed to download and execute a secondary payload. The ML classifier strongly suggests malicious intent. The embedded file 'embedded_file_obj0041.bin' is likely the payload.

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` `89722711492015dde73e80f25de7d6542fbdd962f38ab3a0f288b4d2b5d4663d`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1160 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `f62fe5448f47e710d0c63b223ec12118665fb67790ff4888b53ad014be1b5757`	deobfuscated-js	PDF JavaScript deobfuscation pass	2196 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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