PDF malware analysis — malicious · 60d82ab9d6bed922

MALICIOUS

PDF

514.1 KB Created: 2000-09-12 14:38:23 UTC Authoring application: FrameMaker 7.1 (via Acrobat Distiller 8.0.0 (Windows))

MD5: 81fea5f39cf09ac3874551d9cbe315db SHA-1: 4eaa18a489d0513c7acf8e756b13711dde882f04 SHA-256: 60d82ab9d6bed922ce596e77a36df942b737714974e70a7ad466081ad8286616

340 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded JavaScript that exploits CVE-2008-2992 via the util.printf function, a known vulnerability in Adobe Reader. The script attempts to download a payload from 'http://cgi.adobe.com/special/acrobat/update' by constructing a URL with system information. The presence of multiple JavaScript exploit clusters and a high ML classifier score indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9967

Heuristics 12

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
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.
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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/
- http://www.xfa.org/schema/xci/1.0/
- http://www.xfa.org/schema/xfa-template/2.5/
- http://www.xfa.org/schema/xfa-data/1.0/
- http://www.xfa.org/schema/xfa-locale-set/2.1/
- http://ns.adobe.com/xtd/
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/pdfx/1.3/
- http://ns.adobe.com/xap/1.0/mm/
- http://cgi.adobe.com/special/acrobat/update
- http://www.iec.ch

Extracted artifacts 14

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0033_000.js` `581a926b2e06be96bd070c0afcdf5d583f01f7478efb5ede49ec952327816962`	pdf-javascript-stream	PDF /JS object 33 at offset 0x850	1604 bytes
`javascript_obj0034_001.js` `3bf84668674e23c91aaaa6c58c24a1f80a30566e9cfbd09040882d18101fed76`	pdf-javascript-stream	PDF /JS object 34 at offset 0xA38	902 bytes
`javascript_obj0035_002.js` `39fc16b521de1cb9007eb0aedfc20de325f23ab19ab108becd40cdc75e35fca9`	pdf-javascript-stream	PDF /JS object 35 at offset 0xBA2	13778 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`embedded_pdf_script_0000adcb.bin` `124382112a33622cefb34e435e3f7b152988ce63ebd2b38ca4e8a5010ab8e8d7`	pdf-embedded-script	PDF raw stream script payload at offset 0xADCB	2188 bytes
`generic_stage_recovery_000.js` `bee31fd2e49cdffd9806af08dec7428928493935d4e457f8d7076d9f1acb5abc`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x850	15460 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_001.js` `881b0658441b318291a66b1a76c5a5d086bae8c6bce26b532310b032d1f2bc1b`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 35 at offset 0xBA2	12962 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`combined_document_js_000.js` `752d83d5067a1fd010b4aa61ce5346228a3da6715384076d948d8086b331453a`	deobfuscated-js	combined document JavaScript streams at offset 0x850	16286 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`icc_00_off000091f1.icc` `2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e`	pdf-icc-profile	PDF ICC profile at offset 0x91F1	3144 bytes
`font_00_cff_off000023ca.bin` `c9a90534081969cbe2c5f330cfb723f6e5946db740136c977cd39e9419032514`	pdf-font-stream	PDF embedded font (cff) at offset 0x23CA	722 bytes
`font_01_cff_off00002943.bin` `8d639f3602ea651e2cee3e13acf0aed7a94d014dbb9bdba451cad95ce76a1487`	pdf-font-stream	PDF embedded font (cff) at offset 0x2943	3836 bytes
`font_02_cff_off00003ad4.bin` `5bee0470b49b9a65d3f1c61c184b30a10d3d7183b2c7d5a26827247d58c1fd41`	pdf-font-stream	PDF embedded font (cff) at offset 0x3AD4	4985 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.41, consistent with packed or encrypted content.
`font_03_cff_off00005e33.bin` `c6742687c962cd0c3a0e4cc30e5f812f7c9d716716e671042fd808bef6a82dbb`	pdf-font-stream	PDF embedded font (cff) at offset 0x5E33	1358 bytes
`font_04_cff_off0000651a.bin` `0abf4732b233f533a39f9e043dce32c026361e1d2e62704d7799c3434f395fbb`	pdf-font-stream	PDF embedded font (cff) at offset 0x651A	348 bytes
`polyglot_child_pdf_off00073536.pdf` `6738ef4bfabf2e9bc11364ad8524bbcbd731668d9710dc20f7e21196a5653a6f`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x73536	54106 bytes

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