PDF malware analysis — malicious · 33dfee7020b9540d

MALICIOUS

PDF

1.95 MB Created: 2011-72-51 03:25:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: b19065ee00ab89ffbcfaf48fc2828196 SHA-1: 936065771ac438e8a32bdf5d7a7017270ee01437 SHA-256: 33dfee7020b9540dedd6bc6728fe98a7c5c669e38402ba17e2c2e63e46759e45

210 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 eval() to execute obfuscated code. This script is designed to download and execute a second-stage payload from the IP address 172.16.1.10. The combination of JavaScript execution and the direct IP address in the URL strongly suggests a malicious intent to exploit the user. The PDF also exhibits parser evasion techniques, further indicating malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9779

Heuristics 8

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 (matched inside decoded stream)
Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION

PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL

PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
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.
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://172.16.1.10/
- http://172.16.1.10
- http://www.ascendercorp.com/http://www.ascendercorp.com/typedesigners.htmlUse
- http://www.ascendercorp.com/liberation.html

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `1db8460db841eacf06b80da2c08969bf2b2f3adde35b2d0ca91bcb7f6750d6c8`	pdf-javascript-stream	PDF /JS object 1 at offset 0x610B	538 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`font_00_sfnt_off0004e31c.bin` `77d0fc6988188759e3b29bb709b47e59013d93db4d8e6b458e257a6f6f7a392b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4E31C	10840 bytes
`font_01_sfnt_off000502ff.bin` `747e5fe417574fc568eea0a84112eeceb371a1a4dd3b0b702f52ac75e12896ff`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x502FF	23748 bytes
`font_02_sfnt_off0005451d.bin` `62985b917b9ba3e49bb34f6e82f474b8f2850307b1fc1417a51c4781b8f5f7fd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5451D	46812 bytes
`font_03_sfnt_off0005bbd7.bin` `798c8b83cefbbbe0ef3343074988772ee8e26ec0a470e4473af4456ed291887a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5BBD7	34780 bytes
`font_04_sfnt_off00061584.bin` `c2f214f83e3b7c53a4de47c4c8b7a4299b26e4b7c5c42ae2a5cff30b48a1a474`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x61584	21772 bytes
`font_05_sfnt_off000651c1.bin` `65067a5fb081667384ffa828548e6b993384c6fa15cdfbaf76c8f68f70843c66`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x651C1	30596 bytes
`font_06_sfnt_off0006a370.bin` `7ad3e7562deae03753c97f79cb2a8a39213fd0dbbc04dffce5f13fc4d0a37383`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A370	24588 bytes

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