PDF malware analysis — malicious · 497c57c78b0c9623

MALICIOUS

PDF

9.5 KB

MD5: 85c45a5c8c94e45c66c363a59e8b2ad7 SHA-1: f34aff8f4b617f1903f676549d700c8b0538afbd SHA-256: 497c57c78b0c96239ba54c76078852c1db74a297887e36e5fdf46e7f1f615962

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains XFA forms with embedded JavaScript, indicated by PDF_XFA and PDF_XFA_SCRIPT heuristics. The JavaScript, found in 'deobfuscated.js', is likely responsible for executing a second-stage payload. The PDF_EVAL and PDF_FROMCHARCODE firings suggest code execution and string manipulation within the PDF stream. The embedded file artifact further supports the payload delivery mechanism.

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` `e9aacaca5f2c792b150e3f75f18f8e33e7ff79070eb25d8d80106bf3eb348926`	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` `52a4efd1abfc77ce83b7849292ff410bdecd6761fdcc1236e022840221963699`	deobfuscated-js	PDF JavaScript deobfuscation pass	2090 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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