PDF malware analysis — malicious · 55ae8b0b377c1c1f

MALICIOUS

PDF

90.2 KB Created: 2009-07-11 08:11:56 Authoring application: Scribus 1.3.3.13 (via Scribus PDF Library 1.3.3.13)

MD5: 74da283d83a5a88313f43118e80c51a3 SHA-1: 51d6898a517b6c85fec7d9fa16d1c800dc757fcb SHA-256: 55ae8b0b377c1c1fd0ead20c602474279491c237c3ac74754fb27f32e932b1df

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains multiple embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic suggests that the JavaScript content is obfuscated. The presence of these elements, along with the 'Suspicious extracted artifact' and 'Script obfuscation indicators' firings, strongly suggests that the script is designed to download and execute a second-stage payload. The document body being image-only further supports a lure-based attack. No specific family could be identified.

Heuristics 6

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.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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/xap/1.0/
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/photoshop/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/tiff/1.0/
- http://ns.adobe.com/exif/1.0/

Extracted artifacts 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0052_000.js` `8cf7412e89bb5e766195947392130b91a25b2da2f29f4014d15c2548fa41e788`	pdf-javascript-stream	PDF /JS object 52 at offset 0x15559	10746 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_025_off0000da35.js` `092faa17424489b411d2eb96831ff053ced2a42de1ca549eb68203d64c4730b7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xDA35	10749 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_026_off0000e93a.js` `89c33e8dbab57e43bf395e69269c5c022a83d843b1f4bf103741fe20e76b522a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xE93A	10749 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_027_off0000f845.js` `563769ca33f5499977022281bc4d4d05b44b561a8e4f8852066340f9ca709f39`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF845	10749 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_028_off00010750.js` `66870719eb1b16afff16b06e6e6cc050ce5c8e0dcc46f7f67771b64f1ebfdb2d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x10750	10719 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_029_off00011662.js` `dfc8653886bb2407a0391ae60e991a626e5195e12d2d7732f90ebe1af8ba3e9c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x11662	10656 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_031_off000129c4.js` `791fd878c3b08e2d359ea77ea4b77fdb030dadf0c1222e5c408041d27b7c63cf`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x129C4	10671 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_032_off0001385b.js` `ea75ded344108d52b1c5d8f6227a46c4eea6457802c883498301a6d0c3dac5f3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1385B	10674 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_033_off000146f2.js` `8e3efb1047126555831d285a164c0e2f77b287829f95b9ce2342c91bbbb5a4c1`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x146F2	10710 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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