PDF malware analysis — malicious · fce99c1eb70d8f7f

MALICIOUS

PDF

9.5 KB

MD5: 3bf417847d0ef286cf6148aa11715fd9 SHA-1: 85fe0b10eaba37d6fa08153d877d8996972f3429 SHA-256: fce99c1eb70d8f7fa0b0206becda46891515ce0224248fc74bab3ca2de11ca7a

126 Risk Score

Malware Insights

MITRE ATT&CK

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

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 secondary payload. The PDF_EVAL heuristic also suggests the use of JavaScript eval functions for code execution. The overall attack pattern involves luring the user into opening a malicious PDF that then executes embedded script.

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` `84f600bcabb01b1d92b3edaea0882d84fe285a68399f49ed63f165fa4245ac95`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1163 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `99990b93dde3f7b245a6b1dfed171316180252b47ef45d83da6b822c3afbd81f`	deobfuscated-js	PDF JavaScript deobfuscation pass	2336 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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