PDF malware analysis — malicious · 721a2abe654c63f9

MALICIOUS

PDF

135.3 KB Authoring application: PyPDF2

MD5: 73bcdcbf888cbb23323a42c49c500246 SHA-1: 98f2630a225f1ec8f4f3de87d8e0c69fd98ab108 SHA-256: 721a2abe654c63f98e42c2a0ceb4f7594f9fe32eaea1d8b3d67df235c90078d1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript streams, one of which is heavily obfuscated and utilizes an eval() call, indicating an attempt to execute malicious code. The ML classifier also flagged this PDF as malicious. The obfuscated JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9884

Heuristics 6

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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_obj0005_000.js` `a54372968b8da1d2e0b04d595453e2bea419220a09a7f31a3312388aa9b25fbb`	pdf-javascript-stream	PDF /JS object 5 at offset 0x387	82843 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `c3c5380a61abce90406bfe577f1b540a0017a8256fb869ea10c425f7ba96c8cb`	pdf-javascript-stream	PDF /JS object 5 at offset 0x387	630 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.