PDF malware analysis — malicious · 432f70e99773e34c

MALICIOUS

PDF

9.3 KB

MD5: 36f1a98a394ab4575a13d2d3ea659314 SHA-1: d91a3698e03367d7f97f12574737e9c45767fa9e SHA-256: 432f70e99773e34cb29cef247283c4c48f5ab4c244be072c3dbd53553c0e79c4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File T1566.002 Phishing: Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier with high confidence. It contains XFA forms with executable scripts, and heuristics indicate the presence of embedded script payloads. The deobfuscated JavaScript file extracted from the PDF likely contains the malicious payload, which is designed to be executed by the PDF viewer.

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` `95165095f71153794c36e7408edc372c264a6a790c35ca428692d407b7239b71`	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` `89896cfa64f85e64da07079de8098e4cf3f8b503268fcfc9f6d4d5e7139c030e`	deobfuscated-js	PDF JavaScript deobfuscation pass	1395 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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