PDF malware analysis — malicious · 3b005af689bfc01c

MALICIOUS

PDF

9.5 KB

MD5: e14da086b91e97fb4fecc7a4f526d963 SHA-1: 1c3bbbc57ac5d62bf26d43b03010d2350544a34d SHA-256: 3b005af689bfc01c71a8a5e87c816ac120c86eed6febd0c8d0f60a7d3a23f05d

158 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF contains XFA forms with risky executable scripts, indicated by high-severity heuristics like PDF_XFA_SCRIPT and PDF_EVAL. The embedded JavaScript, extracted as 'deobfuscated.js', is likely responsible for downloading and executing a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a downloader attack pattern.

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` `7fdfd5e5aa615eb09fba91b6adf7843d14e2a30d957429e46e23f263a5d9f796`	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` `67469ddf4b71b36fc42d17e79c3d568263cc376c1c395f1d879135d5e7f7f7ae`	deobfuscated-js	PDF JavaScript deobfuscation pass	2046 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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