PDF malware analysis — malicious · dd8c76800dc57fea

MALICIOUS

PDF

465.5 KB

MD5: f5a8aaca1ea6b4d8c9cf93085b155bbb SHA-1: 9e45979dcdaecbd014060b79c2dee2258ca82943 SHA-256: dd8c76800dc57fea9a8ef0ee79e11c532505fb9ce2c6f561f78589145250888e

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF sample contains XFA form elements with embedded JavaScript, triggering heuristics for heap spray and script execution. The ML classifier strongly indicates maliciousness. The embedded JavaScript, identified as stream_000_off00000040.js, is the primary mechanism for exploitation, likely downloading and executing a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9728

Heuristics 6

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.
XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
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_off00000040.js` `4987dac2c9b75ad0db37d8523b56c26475452b8909fe82e496c71c7fc6e2d423`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x40	4194304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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