PDF malware analysis — malicious · cc5bfbf7e1b36545

MALICIOUS

PDF

13.0 KB

MD5: f77d260f015c771631c6f5a6744d989c SHA-1: 22555920e8b60a4179d33d3c49236b4a1c4438fa SHA-256: cc5bfbf7e1b3654528e7e5df1722f23b53f11177e3ec0b3f19310872bc019569

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains XFA form elements with embedded JavaScript, identified as a heap-spray exploit. This script is designed to download and execute a second-stage payload from the reconstructed URL 'http://adscale.adswerbun.net:8081/nMmNQJR?ahSJ=12&kmSb=12551'. The ML classifier strongly indicates maliciousness, supporting the conclusion that this is a drive-by download attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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_off00001abf.js` `30d8c2f1a3b6dc62abdd13298b80a86901a7227618de7390d9a7cd8009d20bfd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1ABF	97029 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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