PDF malware analysis — malicious · 079db88ad87c552b

MALICIOUS

PDF

2.0 KB Created: 2010-08-08 16:05:20 +04:00 Authoring application: PDFill: Free PDF Writer and Tools

MD5: 78743931ef310e4113d79053bcfffd9d SHA-1: d01ce4f49072f47061ec66caf0d72e55a0753e5a SHA-256: 079db88ad87c552bfb51d585e5d5e5e875e22046084ab633b16e07633e8dbe6c

152 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 utilizes an unescape() call and a heapspray technique, indicating an attempt to exploit a vulnerability. The script is designed to download and execute a second-stage payload, likely from a remote location. The presence of PDF-specific exploit heuristics and the ML classifier output strongly suggest malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 7

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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.
External URI info PDF_URI

PDF contains an external URL action
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.pdfill.com
- http://www.pdfill.com)/S/URI

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `1a37398b177742839dde36ae4c98e01fd9bb4addc46722f1037133af30b00d43`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	330 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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