PDF malware analysis — malicious · 021f9b8f993cf79b

MALICIOUS

PDF

20.9 KB

MD5: d8dc9eaae201733821456ac03401c3f5 SHA-1: d5d792c98c6ebf8e6566e9d2a2682aa10e8ce98f SHA-256: 021f9b8f993cf79b69714732a4f4eb88db5250c8074bffcc7c5e2b0dbff96095

310 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that leverages the CVE-2009-0927 vulnerability, specifically targeting the `Collab.getIcon` function. This JavaScript is designed to download and execute a second-stage payload from the URL http://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_collab_geticon. The use of `eval()` and `unescape()` functions, along with heavily obfuscated string concatenation, indicates a malicious intent to conceal the payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (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://gospeltube.com/cache/.svn/.p/.l.php?l=1&spl=pdf_collab_geticon

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `9fb1996d68ebb4251375f3c983179f225f26aefa1c56030970f2666e8a8a96bc`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `6b490469e34077a8f111f96ed1131872c01b3638db401ae38d0658781d31cfd4`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xEDC	15626 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_obj111713_002.js` `79f2ed60aa6669d163da53fdd5997b2dc2b427b880516bf4f75eca22261223dc`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4C1C	1873 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_obj111711_003.js` `0a72edebf624eb668442a5de142351f6fff26222298d249145f03f0e953084ad`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x1B2	21006 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 16 long base64-like blob(s).
`javascript_obj111712_004.js` `1fa56f1a239ffa3fe5804e57ead12d991840d9980d78cb3c3f63ea950d7dd1f9`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF00	17600 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).
`javascript_obj111713_005.js` `04e54a00b8726fa026823f5bca28436adfc8e09b22964499d09cc51fadd63099`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4C3E	1922 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).
`legacy_pdfkit_stage_000.js` `89429aa36d0b98737c3f4aa422ac175bfc08240e71c043d658505b77f011fefc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xEDC	1524 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `1397a77c63e5e8be02a059fd3c671fb708b92cb64d00ded4f2045e71093dec16`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4C1C	99 bytes
`legacy_pdfkit_stage_002.js` `f186043d544ec1661c04843661fc066e0db1d3f6c90e5a97cfa5c9fe012beb54`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1B2	1624 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `3861ba91e97031eb8cae20ecc784042ce38b8ad8dd7d2784824fdeb20b0ce86f`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xEDC	8224 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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