PDF malware analysis — malicious · 25886d0635ffd223

MALICIOUS

PDF

9.5 KB

MD5: 75ac1b74a7bb0b6a438084dfe0d4c0c8 SHA-1: 6e1e1dd581bf086008b18e63283147a930f797bf SHA-256: 25886d0635ffd2230034b1df95dd4cc15a03fb82f8f08cc28b8479ec93d2be51

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains high-severity heuristics indicating the presence of risky executable scripts within XFA forms, along with embedded file content. The deobfuscated JavaScript payload is likely responsible for executing the embedded file, which is a common technique for delivering second-stage malware. The exact functionality of the script is not fully discernible due to potential obfuscation, but its presence strongly suggests a malicious intent to download and execute further payloads.

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` `e8ee79f0cf0b7b94f8a217cbcfb16722f0e2a663d458a77cf24a845e7f19ab7a`	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` `d7483bbee884d59b6ffd570083c136ecb5927bea2b97e83e045002819a12a226`	deobfuscated-js	PDF JavaScript deobfuscation pass	2349 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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