PDF malware analysis — malicious · b1e081f65b5c080f

MALICIOUS

PDF

724.3 KB Created: 2010-04-27 01:52:02 +02:00

MD5: 4d20fc249198e77b46284e6fd2a11d80 SHA-1: 3a3c72cbf85c2d1159540dfe2d2032886481d188 SHA-256: b1e081f65b5c080faff1c12bbcc5f58ba78a89b0ad6a266f94bf2a9e24b34e7b

122 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams, several of which triggered heuristic alerts for eval() calls and fromCharCode usage, indicating obfuscated code. One heuristic specifically flagged an embedded PDF child with suspicious static findings. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as suggested by the 'PDF_JAVASCRIPT' and 'PDF_JS' firings. The presence of multiple JS streams and the 'PDF_EMBEDDED_CHILD_STATIC_TRIAGE' heuristic point towards a multi-stage attack. No specific family could be confidently identified.

Heuristics 9

Embedded PDF child has suspicious static findings high PDF_EMBEDDED_CHILD_STATIC_TRIAGE

PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
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)
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic (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://purl.org/dc/elements/1.1/
- http://ns.adobe.com/tiff/1.0/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/exif/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/AcrobatAdhocWorkflow/1.0/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 15

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`icc_00_off0000106c.icc` `2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e`	pdf-icc-profile	PDF ICC profile at offset 0x106C	3144 bytes
`font_00_sfnt_off00013e68.bin` `1c9caeabbe7a17e7584598ee4b254b89598c52c7781225d433a81b5a783f85af`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E68	169268 bytes
`font_01_sfnt_off00019f75.bin` `17fe835ba881f7f8715de94174d45edc81c0bc0b98f61aca855dde4590195954`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19F75	167272 bytes
`stream_002_off000031e5.js` `a7bf3968f6b1b5f6b67bb60ebcbd115943ea3ce09c131c900db6ef041f717dda`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x31E5	13131 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 19 eval/decoder/string-building token(s).
`stream_003_off00003fec.js` `ef75178dc5c726c246732f82b203eb7fdcdccb7fa928ca5048a0e18ac01608f9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3FEC	9287 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).
`stream_005_off000049d6.js` `8a26308eea9c72525f80851b2d9bb98f352e95cbed376f6dfeb351ee9daaab86`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x49D6	14878 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`stream_006_off000058ba.js` `9ffe3b3cb04406be0fe049a27115b496dfd3681c12826d0d072ad5e38b55591d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x58BA	3139 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`stream_007_off00005d34.js` `2cf85655b5e4504a07c876fda3c661c0038610a346de305a642d9f0223bb5037`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5D34	44450 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`stream_009_off000081a7.js` `2dd59078323996f941d300e3a789a09fc6b09245a06f5a91de2e94a41c8a58d9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x81A7	8739 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_115_off00077b6c.js` `80a6b8fd0ad629fdc498643b69b950d757215796a4f1a1a0046e79eaefd4fe76`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x77B6C	788 bytes
`stream_121_off000788e8.js` `12dd82be7048d8327a981875eede1bbb7dd56759a33ed09f7f946c64438ad88c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x788E8	2818 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_123_off00078f00.bin` `d31d681b3920d26a812e69946ec71a1942cc460f9c63f3eceed6cf9851d98244`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x78F00	44608 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).
`stream_124_off0007b9a3.js` `cee704957726b41b8f3810c6643be699748b8a9f77a0fb820a8c786f60610086`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x7B9A3	5898 bytes
`stream_128_off0007bf22.bin` `f7fed59236d8844cecbf14431891bfc61b3b244b7ad3cf76f0972b85337a4754`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x7BF22	133468 bytes
`stream_129_off00099c46.bin` `387fe3b5c9990862ce1154fc1c26e563a42c952478eee86062467f58c39f6378`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x99C46	92245 bytes

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