PDF malware analysis — malicious · c4e90d4fd2b9d6a9

MALICIOUS

PDF

9.3 KB

MD5: 384490c9b2593cc39f05e7bfafd2c9cc SHA-1: 01d2cd137d11ad968f12c9d2b3f25d58363902eb SHA-256: c4e90d4fd2b9d6a9be3e45e04124c550f518af6aa52c9561d9b1084a3ab2e5c5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.003 Command and Scripting Interpreter: Windows Command Shell T1204.002 Malicious Link: Malicious File

The PDF utilizes XFA forms and embedded JavaScript, indicated by high-severity heuristics like PDF_EVAL and PDF_XFA_SCRIPT. The deobfuscated.js script, extracted alongside an embedded binary, likely serves to download and execute a second-stage payload. The ML classifier strongly flags this PDF as malicious, supporting the assessment of a malicious PDF delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `12be8fe4fb9d4f47dae93cf75a7ddd7126230e757c129c4e077f3aa7c7ab5084`	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` `59ca86a721896625b36339cc6c482e24504d97fd7ac8dc7b6b25d9a53b727036`	deobfuscated-js	PDF JavaScript deobfuscation pass	2367 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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