PDF malware analysis — malicious · 784bb9a4e0e7babc

MALICIOUS

PDF

9.5 KB

MD5: 5d47e8b2f8bce4ff4e2266bf7ae3df8e SHA-1: ca9827d5204b2218cf40fc4c159228e166ec184c SHA-256: 784bb9a4e0e7babcaba3b54be79b8215b488b90a86d76b71da40d3b4ea32e6f7

126 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains XFA forms and embedded JavaScript, indicated by the PDF_XFA and PDF_XFA_SCRIPT heuristics. The embedded JavaScript, named 'deobfuscated.js', is likely responsible for executing a payload. The PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic further supports this, suggesting the script acts as a dropper. The eval() call and String.fromCharCode usage within the PDF stream point to obfuscation techniques used to hide the malicious script's true nature.

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` `caa1db7afb56f2ef667ac74e6254b03d6d3bf60f7078b6141c554a015956969a`	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` `0eb8940e8b98482390819342330a1d75390808fb8c78c95282af9722d539aa21`	deobfuscated-js	PDF JavaScript deobfuscation pass	2386 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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