PDF malware analysis — malicious · 08975c6893caff11

MALICIOUS

PDF

985.5 KB Created: 2007-03-23 11:58:44 +11:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 6.0.1 (Windows))

MD5: a82c8e124c27f29c618f18d357f6a7d7 SHA-1: 4750543e3b9e8a1502a1d2511cab163e7fe2e4e3 SHA-256: 08975c6893caff11ca3f5d82bd26cc2ca286d6ddcb684ebd2d50c7846e0ae373

174 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation and potential exploit activity. The JavaScript stream, when decoded, appears to be a downloader or dropper, likely responsible for fetching and executing a secondary payload from one of the embedded URLs. The presence of an embedded file named 'PM.joboptions' and a JavaScript file further supports this. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9535

Heuristics 9

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)
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
Additional-actions dictionary low PDF_AA

PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
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. (matched inside decoded stream)
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://map.perucultural.org.pe
- http://perucuzco.com/rupa
- http://www.color.org
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/iX/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/

Extracted artifacts 24

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`PM.joboptions` `5cf97cfee76c3bcd5d889b3138e05d6571e7d097b173dd3eee4be6813c9dd743`	pdf-embedded-file	PDF EmbeddedFile object 228 at offset 0xD29EC	12758 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 long base64-like blob(s).
`javascript_obj0089_003.js` `df3066947d8f229cdc5ab54fccd89226c8e32a3d39abed1675cd48ccccae2eea`	pdf-javascript-stream	PDF /JS object 89 at offset 0x4A1D	9278 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_049_off000981d8.bin` `3a3bdb3024c1c7594b559a72219d0970fadb562266d5620594292cb6bda46799`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x981D8	16457 bytes
`stream_092_off000ed84d.bin` `bb57daef6a5f16139569fd25beec82cabc19b43c498f92b4d5f2c51559875a9b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xED84D	5325 bytes
`font_00_cff_off000d9fd9.bin` `9abe7060e90ed8be0e1fec89f1a019fbf867283cef4a0debc8b191766beade71`	pdf-font-stream	PDF embedded font (cff) at offset 0xD9FD9	6674 bytes
`font_01_cff_off000db64f.bin` `5c65942f428492c8abc256a1873d1c3e2795d1bdc0e855d06c3532e46e69d4e2`	pdf-font-stream	PDF embedded font (cff) at offset 0xDB64F	11628 bytes
`font_02_cff_off000dda84.bin` `b2c1727f677ffe3dfec9efc001de8c5e4faaa3b9664b51f9075150e21b3e2697`	pdf-font-stream	PDF embedded font (cff) at offset 0xDDA84	1739 bytes
`font_03_cff_off000de10b.bin` `89a4a8dda94376ff41fc66e14938d1343aae1e52401ab0c1ca7dc87b05705dd7`	pdf-font-stream	PDF embedded font (cff) at offset 0xDE10B	344 bytes
`font_04_cff_off000de2b1.bin` `f290febfe9f86dbc8eebd9f05545249d120076d2494b0c17e6fd694db951db59`	pdf-font-stream	PDF embedded font (cff) at offset 0xDE2B1	5427 bytes
`font_05_cff_off000df3c2.bin` `23cc21031d2e5d14daedc236dbf5dda61ff77b869762958f56d5e8c74c924d90`	pdf-font-stream	PDF embedded font (cff) at offset 0xDF3C2	4550 bytes
`font_06_cff_off000e0383.bin` `732ee10c168e303c1c43016af0a795812870fafae85fd701e4462ab7be39ec74`	pdf-font-stream	PDF embedded font (cff) at offset 0xE0383	10989 bytes
`font_07_cff_off000e25b8.bin` `286024b2e1c1cf26dbb20d06dcf67216d33dcddd65487a7c969bfed5d83890b1`	pdf-font-stream	PDF embedded font (cff) at offset 0xE25B8	3765 bytes
`font_08_cff_off000e324e.bin` `c0e3eb9477d2098a35ea52b3a3d44bd668bc8647f27d8d0b5e6717fabbce04e2`	pdf-font-stream	PDF embedded font (cff) at offset 0xE324E	5981 bytes
`font_09_cff_off000e4721.bin` `d8091add2fe5839ae7d6819262ab968261e71c56c89e4c76b50e6d955c781a91`	pdf-font-stream	PDF embedded font (cff) at offset 0xE4721	8710 bytes
`font_10_cff_off000e6356.bin` `72e8655da6974c1a005ce24079cd80acad9bc4c95c6e0d465a85f1bcb433e5e0`	pdf-font-stream	PDF embedded font (cff) at offset 0xE6356	146 bytes
`font_11_cff_off000e643b.bin` `7f5f582bed9380cd2704c3d17a78a339fe597f922bcab47428620dc64c1ea86e`	pdf-font-stream	PDF embedded font (cff) at offset 0xE643B	3834 bytes
`font_12_cff_off000e7111.bin` `2a0957fc9e4ec2619aaea996482308e1547550ad838f9858471cced9d07aec4f`	pdf-font-stream	PDF embedded font (cff) at offset 0xE7111	3282 bytes
`font_13_cff_off000e78b0.bin` `0747bf0982ce38a787d73551ee531011328d6483fa745e3e9c436d086fad9cb6`	pdf-font-stream	PDF embedded font (cff) at offset 0xE78B0	20543 bytes
`font_14_cff_off000eb451.bin` `f77b47d6881cc9918e03da6250e4bddd966705c75b72243401299b6b47a402e7`	pdf-font-stream	PDF embedded font (cff) at offset 0xEB451	12390 bytes
`font_16_cff_off000ee95c.bin` `93aec3901c615fe223cf0d1b99089b90c4496b5ef5d998ccb525b4a8cd4e74c2`	pdf-font-stream	PDF embedded font (cff) at offset 0xEE95C	4326 bytes
`font_17_cff_off000ef938.bin` `3a5dfd1f9eb957ee039d7e49012a41e76f45cd3b6760f556ad86e9f90ac05c20`	pdf-font-stream	PDF embedded font (cff) at offset 0xEF938	5038 bytes
`font_18_cff_off000f0af4.bin` `3d35cd988b24f9766e76ac72688f03029298df676e285947740e08506d26434e`	pdf-font-stream	PDF embedded font (cff) at offset 0xF0AF4	2382 bytes
`font_19_cff_off000f2d69.bin` `6a315c4e6a74aa87bbe309ebbd49ffae0379b12994da202552ac98107857a98f`	pdf-font-stream	PDF embedded font (cff) at offset 0xF2D69	8350 bytes
`font_20_cff_off000f46f8.bin` `93adbde5569c00297551e68ebd8f09443ed004df2653137c81efc7951c2ba93a`	pdf-font-stream	PDF embedded font (cff) at offset 0xF46F8	1729 bytes

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