PDF malware analysis — malicious · c51035722968afc5

MALICIOUS

PDF

9.5 KB

MD5: 976c824d61eef7220eed0c1eb0ddf7ef SHA-1: b7723c6dd5fda9c9a22f22f30f415ace342dde66 SHA-256: c51035722968afc5102508dc4eb98911f3ac4c49e26d01a606fd5cc2bef9ffc0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Scripting: JavaScript T1204.002 Malicious File: Malicious File

The PDF contains XFA forms with embedded JavaScript, flagged by high-severity heuristics. The deobfuscated.js artifact indicates the presence of executable script content. This script is likely responsible for downloading and executing a second-stage payload, as suggested by the ML classifier's high confidence score and the embedded script payload heuristic.

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` `9f4e84e249ea73e98c1dd731bfaa2d4735e7912e3b9b7424fd5161ee29e6026a`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1162 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `04e72b00c6ccf2386927d6572a08ffd5bd6ee35896f1c52dbd544b61e129c4eb`	deobfuscated-js	PDF JavaScript deobfuscation pass	1511 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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