PDF malware analysis — malicious · 8497aa331422114b

MALICIOUS

PDF

24.6 KB Created: 2010-09-10 02:11:18 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14) First seen: 2013-03-24

MD5: 4616d02bded6692404b840f9363e2ac9 SHA-1: f650d501010de9d6efa906e796e1400a65135755 SHA-256: 8497aa331422114b3967cde40c32090411709988cccbacbd975901f776b751e7

92 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript and an embedded file, indicating a multi-stage attack. The JavaScript is triggered by document actions and uses known obfuscation techniques, suggesting it's designed to download and execute the embedded file. The ML classifier strongly flags this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

JavaScript action low 1 related finding 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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (identified after nested-decoder de-obfuscation)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://ns.adobe.com/xdp/ In PDF document text
- http://www.xfa.org/schema/xci/1.0/In PDF document text
- http://www.xfa.org/schema/xfa-template/2.4/In PDF document text
- http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
- http://ns.adobe.com/xtd/In PDF document text
- http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0021.bin`	pdf-embedded-file	PDF EmbeddedFile object 21 at offset 0x5873	13430 bytes
SHA-256: `0309db5850dea096d566c8ed55dab6d656854b8b97c501a4ba94a0df94dbb272`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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PDF

Malware Insights

Machine Learning

Heuristics 10

Related samples 6

Extracted artifacts 1