PDF malware analysis — malicious · 98bb77a9afbddde5

MALICIOUS

PDF

174.0 KB Created: 2009-08-31 10:11:27 +08:00

MD5: 67b19a04bdbd0adc3b39130a26331493 SHA-1: 90673c1f7025427732a5d5c890fc6b1723823adc SHA-256: 98bb77a9afbddde5acad758cc4b0df662925caded3cea5a712d4d21ee1fed2bb

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains an embedded JavaScript stream which exhibits signs of obfuscation and uses eval() and String.fromCharCode(). This script is highly likely to be responsible for downloading and executing a second-stage payload. Due to the obfuscation, the exact nature of the payload and its destination could not be determined. The embedded artifact stream_004_off00000675.js is the primary indicator of this malicious behavior.

Heuristics 7

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. (matched inside decoded stream)
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. (matched inside decoded stream)
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
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://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00000675.js` `331cf1ca2521e817c7d0a847c0653ee63e0fbe5fd30dcf1e4531b2ca1556a0e2`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x675	3658 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`objstm_0026_00.bin` `c6b88e7ad5407bb6452cfebf80ef7ca1f6e716deaceda4e2898e10adf9bd3d5a`	pdf-objstm-decoded	PDF /ObjStm 26 0 obj (inflated)	306 bytes

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