PDF malware analysis — malicious · 79fa834d5ebdf5f5

MALICIOUS

PDF

11.2 KB

MD5: 9930866c7b6a491be16e5820dc160797 SHA-1: b1ada98aba5d156d60c1015c5efd9f103de085da SHA-256: 79fa834d5ebdf5f5db0bf9504c684358a6a183ef3972fec00dc13d43c4df3a14

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains XFA (XML Forms Architecture) with embedded JavaScript, which is a known vector for exploiting vulnerabilities. The 'PDF_XFA_HEAP_SPRAY' and 'PDF_XFA_SCRIPT' heuristics indicate the presence of exploit code designed to spray the heap and execute risky scripts. The reconstructed URL from the document body suggests a potential command and control or payload delivery mechanism. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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_off000016d3.js` `8732ed480a78007ea559b49f20e54d3396c7042af4386c42a4201d2bae6f2319`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x16D3	20423 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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