PDF malware analysis — malicious · 2bdf33ad040c131f

MALICIOUS

PDF

54.1 KB

MD5: f6611ce3a1e9471265aaf858446db97f SHA-1: 1c0a53e9576f4b301252120f1ba95f970986c843 SHA-256: 2bdf33ad040c131f582c18b49a09af80483623fa1a03039bd7a5b351908608cc

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File: User Execution: Malicious File

This PDF file contains XFA form elements with embedded JavaScript that utilizes a heap spray technique, indicating an attempt to exploit vulnerabilities. The embedded script, identified as stream_000_off0000186d.js, is highly suspicious and likely responsible for downloading and executing a second-stage payload. The reconstructed URL 'http://th3x29c.ru:8888/icon_wink.php?email=69&promos=4&ratings=151&poll=588&index=77' is a critical indicator of a malicious download source.

Machine Learning

Nyx PDF Classifier malicious score 0.9677

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_off0000186d.js` `26f8156313aae94a09ec84baf1196503142239943be75823c9a3d0c2c496caae`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x186D	169180 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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