PDF malware analysis — malicious · 1b13beb16c817700

MALICIOUS

PDF

54.1 KB

MD5: b76999342effff9e4735724eb2d31d6e SHA-1: 0e9890c3523ccf1a55c16e4341e533fcda6fa293 SHA-256: 1b13beb16c8177005b6345dfdf795a5513599e4fddb5123d74ec68cc84c9545e

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

This PDF file contains XFA form elements with embedded JavaScript that triggers a heap spray exploit. The ML classifier strongly indicates maliciousness. The embedded JavaScript, reconstructed from character codes, contains the URL 'http://xugardopola.info:80/renew.php?pixiel=105&samusung=4&training=151&demos=447', which is likely used to download and execute a second-stage payload. The presence of XFA and JavaScript points to a common delivery method for exploit-driven attacks.

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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