PDF malware analysis — malicious · 6bac934247a9a92d

MALICIOUS

PDF

1.26 MB Created: 2010-07-29 10:43:38 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)

MD5: f025f2a3a70f842bcc28196be0db22dd SHA-1: 546ce7da6e193028db48f4e720e0328ace7b6b84 SHA-256: 6bac934247a9a92dc9ae52c3064fd67acf8690b67263de7e0a9089c41448ef21

158 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 unescape() and String.fromCharCode functions, indicative of obfuscation and potential exploit code. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript appears to be an implementation of MD5 hashing, which is often used in exploit kits or to obfuscate malicious URLs. While no direct download URL is immediately apparent, the presence of exploit-related JavaScript suggests the PDF is designed to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9898

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
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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.
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.monotype.comMonotype
- http://pajhome.org.uk/crypt/md5
- http://ocsp.verisign.com/ocsp/status0
- https://www.verisign.com/rpa0
- http://www.monotype.com/html/mtname/ms_timesnewroman.htmlhttp://www.monotype.com/html/mtname/ms_welcome.htmlhttp://www.monotype.com/html/type/license.html
- https://www.verisign.com/rpa
- http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0
- http://www.microsoft.com/typography
- http://www.iec.ch

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0055_001.js` `82458b7f7ae580ba38ec758e90e08a61b540fe5ec7d10bac880f02c08401ccf0`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBAE	13794 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 15 eval/decoder/string-building token(s).
`javascript_obj0055_002.js` `90c98395875f87b51ec7773233856ad28f0790aec47a5e28c1479a7092e36744`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBD2	15287 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 15 eval/decoder/string-building token(s).

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