PDF malware analysis — malicious · 3e29b8402418a18c

MALICIOUS

PDF

19.4 KB

MD5: 5784fb6d19caeb36584b133600c6a3c3 SHA-1: 57a24c3e724656593e7158d97997cda0c461cde6 SHA-256: 3e29b8402418a18c3e51ce863dce8754ebcbf144d282f113d8ad8f9eba71a000

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains XFA form elements with embedded JavaScript, triggering a critical heap spray vulnerability. The extracted JavaScript, although partially obfuscated, contains a reconstructed URL: "http://ctosmama.org:80/uRBGmB63?TVsA=4&dqWo=151". This script is designed to download and execute a second-stage payload, which is a common technique for initial access and further system compromise. The presence of XFA heap spray and embedded script strongly indicates malicious intent.

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_off00000bf4.js` `60bff7a6ff134c2ea4ac713cc5cfead2e9a50d5f92942222f1dec5ef40ff3c03`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xBF4	403567 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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