PDF malware analysis — malicious · af7ac52860f07dd1

MALICIOUS

PDF

25.8 KB

MD5: 1f8c74c28124fffc32e4210654962026 SHA-1: 2809e4876a90e5d059d6a8caaf88bd0ba2df212f SHA-256: af7ac52860f07dd16b8764bcebd117a608d792e83023943cd4d145435aab12ed

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded XFA forms with risky executable scripts, indicated by high-severity heuristics like PDF_XFA_SCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD. The ML classifier strongly flagged this PDF as malicious. The presence of an embedded file object (embedded_file_obj0008.bin) suggests it's a dropper for a secondary payload. The unescape() call and String.fromCharCode usage point towards obfuscated JavaScript execution, a common technique for downloading and running further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xfa-template/2.5/
- http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `a916d522c87faa4def2bfc8c83f9b9f510486de32d5ca3e638de7dc81bba7845`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xC6	25702 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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