PDF malware analysis — malicious · 9681b3e6fcca4fcf

MALICIOUS

PDF

9.3 KB

MD5: 4a37a1efc12bcf1669c96935bd944ff4 SHA-1: f05902facd0de07b44281b2aa38b6b0cd1f48178 SHA-256: 9681b3e6fcca4fcf8e8f2885fdbf8829e7af18ce4c1d594f3c009217347ae6e5

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains XFA forms with executable scripts, indicated by PDF_XFA_SCRIPT and PDF_EVAL heuristics. The embedded JavaScript, named 'deobfuscated.js', is likely responsible for executing the payload. The PDF also contains an embedded file, suggesting a multi-stage attack. The exact nature of the payload is not fully discernible from the provided information, but the presence of script obfuscation indicators points towards a downloader or dropper.

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` `22788b5c8bc37b3b0efc2ee1a59eb4c70081124a03ebf4c2c32ef9194f00340a`	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` `e77c9e1631748612c8053c6f0e1ed9d37664b6461e8d65c796cb408d97177833`	deobfuscated-js	PDF JavaScript deobfuscation pass	2188 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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