PDF malware analysis — malicious · 82244f9874e40a77

MALICIOUS

PDF

6.0 KB

MD5: dbf583b080208d36b87a5bd3a10d425d SHA-1: 53c5ef430a26b29ae34d4ac19e1dd0826aaa6fa8 SHA-256: 82244f9874e40a773e7de43a29d7c06fcb3d335f34820e27d1e7de220a7251d1

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF utilizes XFA forms, a known vector for embedding executable scripts. High-confidence heuristics indicate the presence of a risky executable script within an XFA form. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript, stream_000_off000008c4.js, is likely responsible for executing the malicious payload, though its specific actions are not detailed in the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 5

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.
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_000_off000008c4.js` `548e6f1dd5d59988cf7ce3af07e5caf1f350bd659391580302594765e1a231bb`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8C4	14767 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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