PDF malware analysis — malicious · f52a0c3c99f9c0f7

MALICIOUS

PDF

9.5 KB

MD5: 3a335b911c5b2c65dc33d6084e0bd477 SHA-1: e98b27b72eea8a1cd4c77aa82c5e8ef0f8573e79 SHA-256: f52a0c3c99f9c0f73e2d0cefd828a71d3f07aecad8abf4ace5b15c15e6c19eff

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA_SCRIPT heuristics. The ML classifier strongly flags this PDF as malicious. The deobfuscated.js file suggests the script is designed to download and execute a second-stage payload. The presence of XFA forms and eval() calls further supports a malicious intent.

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` `d7b5f5e0064d502ef82fa4e1740b29db71a3a963f63e9a17bb198717df799566`	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` `7a6835bcefad5d06cade4fb3874cf9cda6a5141fedd1ef813ce440e95d595192`	deobfuscated-js	PDF JavaScript deobfuscation pass	1874 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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