PDF malware analysis — malicious · 531b49d9215b1698

MALICIOUS

PDF

9.5 KB

MD5: bbeb7a2b43e65c80d0589f1931e04f8e SHA-1: 61b1a202a7f21ccbd3a1add7f40dd4e9f0daaef7 SHA-256: 531b49d9215b1698e082a204477663d5fc088f9040fa88f5b1946a10802e745d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Scripting: JavaScript T1204.002 Malicious File: Malicious File

The PDF contains XFA forms and embedded JavaScript, indicated by the PDF_XFA and PDF_XFA_SCRIPT heuristics. The deobfuscated.js artifact suggests the script is designed to download and execute a second-stage payload. The ML classifier strongly flags this PDF as malicious. The embedded file and script indicate a multi-stage attack.

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` `3d0344386930ac26aafb9b1280d50a51c9d631e2ec7068228dd1cb75fbae660c`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1165 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `5d39845392774f10f94ddf3450293f1c86fdb30fd8ea2125d261bbba85978cbc`	deobfuscated-js	PDF JavaScript deobfuscation pass	2229 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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