PDF malware analysis — malicious · 1863a08cb2e4d91b

MALICIOUS

PDF

213.2 KB Created: 2012-03-27 11:53:12 +02:00 Authoring application: swissforms Solutions

MD5: 9139544178d2257c77b9d4e8e43f3cf0 SHA-1: deeb93cf6f4faf7bf5556b1bafb384454b4a6d81 SHA-256: 1863a08cb2e4d91b0d82739c3d56c2e1975f799b88bc57f61a8dd481d0d477b1

214 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple JavaScript streams, several of which trigger critical heuristics related to eval() and unescape() calls, indicating obfuscated code execution. The presence of a PDF JavaScript exploit cluster strongly suggests the sample is designed to exploit a vulnerability to execute arbitrary code. The embedded URL 'http://pajhome.org.uk/crypt/md5' is suspicious and may be used to download a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.6150

Heuristics 10

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)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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)
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
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://pajhome.org.uk/crypt/md5
- http://www.unicode.org/reports/tr35/tr35-11.html#Number_Format_Patterns
- http://www.unicode.org/reports/tr35/tr35-11.html#Lenient_Parsing
- http://unicode.org/reports/tr18/

Extracted artifacts 26

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0077_000.js` `033cfe2ae60e1528f65c10fad3d200ead3549102d1ab209f12b58088bf2f12f5`	pdf-javascript-stream	PDF /JS object 77 at offset 0x1C07D	45 bytes
`javascript_obj0001_004.js` `09cc9bcbd59acf82e2be4a41727eedce5a538a736f2d65749c8b14153d70c125`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	4875 bytes
`javascript_obj0004_005.js` `c2f9e45a2d3f7ffd224908e29db59dec89b6f57df138d3bb5892cfc8e5e92c26`	pdf-javascript-stream	PDF /JS object 4 at offset 0x680	17129 bytes
`javascript_obj0006_006.js` `157d94c4373fc7674528b2b92bd73c7fb605ba41abc50f521589bd013af87b68`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1508	21193 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0008_007.js` `e6148b768af5b12460cf3e62fbab899b427b7493847763e208cddbfbe94685cd`	pdf-javascript-stream	PDF /JS object 8 at offset 0x36E8	33138 bytes
`javascript_obj0010_008.js` `7a0d61602467a3ebb51eeb3dc0b4e5557e5cf228aa7352a5e4c4de5b6ad1e63e`	pdf-javascript-stream	PDF /JS object 10 at offset 0x5D2E	144013 bytes
`javascript_obj0012_009.js` `5076026448694df07d81995a6f52f2135c18b2bd6d0340fdaeebe7c5d9c2e63d`	pdf-javascript-stream	PDF /JS object 12 at offset 0x12A1A	8595 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0014_010.js` `f667de1ba2f5689c2db6ca8efec22f4cae905543c7e55765301e47c9d3e39d66`	pdf-javascript-stream	PDF /JS object 14 at offset 0x135F8	1049 bytes
`javascript_obj0016_011.js` `b6b999b2adc788b5c0dc152162423f5f3b63e2f337dfedd2c9460233e3dfeb59`	pdf-javascript-stream	PDF /JS object 16 at offset 0x138AE	6511 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0018_012.js` `6bf6a9f966c7e84faccf5e1acbfdf2980a18334f7c940bcfc5fb9e40ee1ba433`	pdf-javascript-stream	PDF /JS object 18 at offset 0x13F28	10822 bytes
`javascript_obj0020_013.js` `0ef5292eaf41a7acfb5be96479c28e894fecc14d034141148df12559285bac3f`	pdf-javascript-stream	PDF /JS object 20 at offset 0x14766	16050 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0022_014.js` `171aac8e2208b35087228e919d8c6b105689701aebd7f411e407cdb6ab3fbd35`	pdf-javascript-stream	PDF /JS object 22 at offset 0x1538A	14156 bytes
`javascript_obj0024_015.js` `357ea0785b09f7df52440b553e24163e28a33a0338f6e8362055f93fb7167ae6`	pdf-javascript-stream	PDF /JS object 24 at offset 0x16151	24495 bytes
`javascript_obj0026_016.js` `188a908fa79d1ccbba0b7fd097a9dd6d806a0b6a12816b4d6f1fa830305aed24`	pdf-javascript-stream	PDF /JS object 26 at offset 0x1778E	2847 bytes
`javascript_obj0028_017.js` `a862c3ff0be4b6e8e1a4ed20ca59fdded0cb583d2442c945783e90d4e1f7a7af`	pdf-javascript-stream	PDF /JS object 28 at offset 0x17B83	10040 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0030_018.js` `e66c83b43272af17b0ed43ded35819c9f2825ef88d352cce828881d135b64e16`	pdf-javascript-stream	PDF /JS object 30 at offset 0x18440	4291 bytes
`javascript_obj0032_019.js` `f0ec97d840ccf21d7d3207b6e09077506386513958c94020bc39ca48dfe900a1`	pdf-javascript-stream	PDF /JS object 32 at offset 0x18943	11981 bytes
`javascript_obj0034_020.js` `e1eb1ae9a28ca6809e490ab94557d9217f0ed671a55379737b41e00e159fd8d3`	pdf-javascript-stream	PDF /JS object 34 at offset 0x19439	3240 bytes
`javascript_obj0036_021.js` `5c846df3aa78f4be63ebcbf1ee92a28b359eed60e284693e5daa5203b284a497`	pdf-javascript-stream	PDF /JS object 36 at offset 0x1981C	8284 bytes
`javascript_obj0062_022.js` `88cf83eacfa4ab997462d207c0c2ed6b53626fc3794ce976e7bdf29d2c84f5d4`	pdf-javascript-stream	PDF /JS object 62 at offset 0x1A156	213 bytes
`javascript_obj0068_023.js` `f24f44ca9d60dd42a63432989aaa4b625b3f58ca8efbcc9b7f760bb4a53d1e2a`	pdf-javascript-stream	PDF /JS object 68 at offset 0x1A21C	107 bytes
`javascript_obj0073_024.js` `d525969f37c2901a8a7bbb3f0c165714e656d3de62dc328dfaca4fcf93c5f648`	pdf-javascript-stream	PDF /JS object 73 at offset 0x1A2B4	22529 bytes
`javascript_obj0075_025.js` `92b7e8047d7db76b49f4b17cafb0874db7de5823f779184a767eb82d602c3560`	pdf-javascript-stream	PDF /JS object 75 at offset 0x1B3B5	26599 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`font_00_sfnt_off00024424.bin` `5eed140d5a671f128f7d4cc7e64d4eec766b38e1a6439b33e206bdb438ee7e0f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x24424	21716 bytes
`font_01_sfnt_off000262a0.bin` `d95f58a119f91bee73a40907be6e78ab66835e98b1a3fa115966739358824f25`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x262A0	7520 bytes
`font_02_sfnt_off0002cf67.bin` `a6996f0f8cf243a903f852ac10837001b654e974e6d08713043a19bf9c48259d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2CF67	34636 bytes

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