PDF malware analysis — malicious · 08a6788c7129a684

MALICIOUS

PDF

22.0 KB

MD5: 3bdb646c9b3c72ddff65ad3ff5458a45 SHA-1: 7362f78f0da46434745a85f93e4aab150861dec8 SHA-256: 08a6788c7129a684c2073ab030ef2694905ef4363a84ac948fd4fb2ec69d8884

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that exploits CVE-2007-5659 (Collab.collectEmailInfo) to download a second-stage payload from the URL http://rach.com.sg/nusoap/.svn/.pack/.l.php?l=1&spl=pdf_collab_action. The JavaScript uses eval() and unescape() functions, and string concatenation to obfuscate its malicious intent. ClamAV detected shellcode within the extracted JavaScript, further indicating malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
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.
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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://rach.com.sg/nusoap/.svn/.pack/.l.php?l=1&spl=pdf_collab_email

Extracted artifacts 11

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `c2da4238d4c47f5dbc2a64465f941c9d45965a7873fd14dce9d31215b7b21547`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3674 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111712_001.js` `96a653fece16a68e98ba962ebabefe496beef390e71e6ab79f4d12ca4e2b984b`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x101E	16854 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111713_002.js` `92421f7236b2b8e9b21bc9d171a544da6e03f16308a72b6b51ea9647aca14673`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x522A	1437 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111711_003.js` `c07809709b8bf4acd03f90d080f67d5d936827a94b3bbb945c33129008ad3ec8`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	22120 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 13 long base64-like blob(s).
`javascript_obj111712_004.js` `da5fb91b4f2d367581dc5324544145172c455b5feecf097ee0ca7eace795ebe9`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1042	18392 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 8 long base64-like blob(s).
`javascript_obj111713_005.js` `c256b00b9731c4b1eb2a0c103a3cd3abc528382a680966707a813b9ec0df3ea6`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x524C	1486 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `925dabee3c407229a75d7af3bf4aeee1ae8c8eb4998ce27e724fb76ff8b64634`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x101E	16170 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 44 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `2980c43bc87d5be7250b5a4723bf3bcd3c36cacd277bc6999297ca7fa121bf1e`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x101E	1469 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `4141becd08508f7617aff04f6e2e4b04b51590e68498acbb9fcef536909257d8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x522A	82 bytes
`legacy_pdfkit_stage_003.js` `4fac7be3c6d88117155dc12b97801b8b8c87d5bc654567c23d99941e5018aaab`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_004.js` `c7f20f6f6a30f5aa9746392f5c64a5c13c963a942d106d62b3f20661233139e8`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x101E	7847 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 15 eval/decoder/string-building token(s).

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