PDF malware analysis — malicious · cfac47906fbfd031

MALICIOUS

PDF

20.7 KB

MD5: e4d2571190c010e3df286812d8536865 SHA-1: f50d52d6d8761348c516f6a23558b2a73374a4af SHA-256: cfac47906fbfd031c9effb099d1cdfe7f503f7e0b31a40f3ab2008663a434141

170 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Service Execution: JavaScript T1204.002 Malicious Link: Malicious File

The PDF file contains XFA form elements with embedded JavaScript that triggers a heap spray exploit. This script is designed to download and execute a second-stage payload from the reconstructed URL: http://nutrientals.org:80/webapp.php?oreill=4&grouspn=151&login=166&left=619. The ML classifier strongly indicates maliciousness, supporting the exploit and payload delivery intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9961

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_off00001523.js` `ce7b2cfce96e92426962766f01a184e513a093c87f827846d535201aa782b7e8`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1523	151903 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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