PDF malware analysis — malicious · 17ba721b8ee72035

MALICIOUS

PDF

25.5 KB Authoring application: PyPDF2

MD5: f1f75f3ff499357ce9f9136c34f91281 SHA-1: df6dfcfc842a3c47c2ba3f0534a92e431df81f37 SHA-256: 17ba721b8ee720352f2ddaeeb478ebf230b1ee26c1610d83d7bd713cf019d4bc

416 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 that is heavily obfuscated and utilizes eval() calls, indicating an attempt to hide malicious functionality. The presence of PDF JavaScript exploit cluster heuristics and ClamAV detections (Js.Downloader.Email_phishing-1) strongly suggests the script is designed to download and execute a secondary payload. The document is also an image-only lure, further supporting a phishing or social engineering attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

Heuristics 12

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.
ClamAV: Js.Downloader.Email_phishing-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Downloader.Email_phishing-1
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
Image-heavy PDF hides clickable URL with PDF string escapes high PDF_ESCAPED_URI_IMAGE_LURE

PDF is image-heavy with little real text and its clickable HTTP(S) URI is encoded with PDF octal escapes. This combination is common in credential-phishing PDFs that render a screenshot-like prompt and obscure the destination from simple URL extractors.
Suspicious extracted artifact high 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.
Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE

PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 25 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
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 low PDF_URI

PDF contains an external URL action
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.worldblindunion.org/

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `3a2274ca680d118cd61521598e78ab8da8bb0a2fc601fde6e90395542d3f8965`	pdf-javascript-stream	PDF /JS object 11 at offset 0x907	7047 bytes
Detection ClamAV: Js.Downloader.Email_phishing-1 Obfuscation or payload: likely Carved artifact contains 7 shell/COM execution token(s). Carved artifact contains 18 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`javascript_obj0011_001.js` `9707af73abf22082c89089e4b577b91e144fb68380ba8a32beb71e7ca6e5bfa2`	pdf-javascript-stream	PDF /JS object 11 at offset 0x907	39 bytes
`embedded_pdf_script_00001bf9.bin` `d308e8d8f7568e40ce9d00630c3035a7628bb8ec45f9652673ee86d550d43288`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x1BF9	26101 bytes
Detection ClamAV: Js.Downloader.Email_phishing-1 Obfuscation or payload: likely Carved artifact contains 7 shell/COM execution token(s). Carved artifact contains 18 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `029f48dbe38830a5f26de0c73f3cc5d382045edda3a11981f7147194a8d7401e`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0x973	25985 bytes
Detection ClamAV: Js.Downloader.Email_phishing-1 Obfuscation or payload: likely Carved artifact contains 7 shell/COM execution token(s). Carved artifact contains 18 eval/decoder/string-building token(s).

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