PDF malware analysis — malicious · 3c54fd1b8cf103c0

MALICIOUS

PDF

750.2 KB Created: 2008-07-17 23:28:44 +08:00 Authoring application: Acrobat PDFMaker 7.0 for Word (via Acrobat Distiller 7.0 (Windows))

MD5: 81bc3eea1c644d109cebe191257c7efe SHA-1: 44953b48ff48dc97bda13de7f7e837db1a78752e SHA-256: 3c54fd1b8cf103c003c69eb43a9b623ad3e3bfb923f5d6c3313d4da03cea73c9

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE finding suggests a secondary embedded PDF with similar suspicious static findings. The extracted JavaScript stream (stream_039_off000ba238.js) is the primary indicator of malicious activity, likely responsible for downloading and executing a second-stage payload. The confidence is high due to the critical heuristic findings and the presence of executable script content.

Heuristics 8

Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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.
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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/pdf/1.3/
- http://ns.adobe.com/pdfx/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/photoshop/1.0/
- http://ns.adobe.com/iX/1.0/

Extracted artifacts 21

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_039_off000ba238.js` `98e3c3ca0476ffedc3c2fffc3d2bff11646ce68d12d65706966657d0d9c107a5`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xBA238	3433 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`icc_00_off00034faf.icc` `eb03db58ff1f226c83103a11f30b5520f9b68a7ced67daa78992723e3ea0411d`	pdf-icc-profile	PDF ICC profile at offset 0x34FAF	1320 bytes
`font_00_sfnt_off0004aed7.bin` `194f92554034e60257983fd76c25151d6467c7ccb45ac5cd515d30b204d2726c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4AED7	3864 bytes
`font_01_sfnt_off0004bbcb.bin` `86a191427cdeb783c11e7a9c40550fd03af1c89a97ba2a9338536d55595ec542`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4BBCB	9544 bytes
`font_02_sfnt_off0004d8af.bin` `6c5af6f6b1048f2e36c644cc4a05628c6f098238f0c539d8a50a9ec1c4cfbe3b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4D8AF	16936 bytes
`font_03_sfnt_off00050e29.bin` `b46e1bb1ce712c597f79aebabb74eee9ed80499ff7f336fe85e9039354a96543`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x50E29	6440 bytes
`font_04_sfnt_off0007adaf.bin` `2760dba94bf8c72ce9ea0b9d2c69715633d7f3bf89812dfa37b3e5c06656e96b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7ADAF	5948 bytes
`font_05_cff_off0007ba1e.bin` `f929b154c1739393f86aafaa33ea11e998d4237547ea87853bf41ee35a809f31`	pdf-font-stream	PDF embedded font (cff) at offset 0x7BA1E	1767 bytes
`font_06_cff_off0007be41.bin` `2da564aa77ed7be83abdc9c2db412b62ed648ac7b3ace1ee84e4748d253f2a22`	pdf-font-stream	PDF embedded font (cff) at offset 0x7BE41	3549 bytes
`font_07_cff_off0007cb67.bin` `26742da0e57b265b55cbcfc487443296d46f82eb8707e6517b9a4968fa675a6a`	pdf-font-stream	PDF embedded font (cff) at offset 0x7CB67	7073 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.42, consistent with packed or encrypted content.
`font_08_cff_off0007e3c1.bin` `4e850c53faa0e66014ecbc97db8ee6328db8a114809ee3ff2aecd2e894efe2d3`	pdf-font-stream	PDF embedded font (cff) at offset 0x7E3C1	7042 bytes
`font_09_cff_off0007fa74.bin` `2cc8cb05e41dc348b960cb086767796c494fbe8636258dcc6dbf1ed773dc3992`	pdf-font-stream	PDF embedded font (cff) at offset 0x7FA74	1915 bytes
`font_10_cff_off0007ff62.bin` `79c92dda5fe77c55cda21a49184a8caff2d2f402537352979d909e8b5b8a1213`	pdf-font-stream	PDF embedded font (cff) at offset 0x7FF62	7329 bytes
`font_11_cff_off000818a7.bin` `2c7746eb32712e6328a9ae394afdd9cb6eb32a97da86e79b7bcb2f83f373a0bc`	pdf-font-stream	PDF embedded font (cff) at offset 0x818A7	4793 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.42, consistent with packed or encrypted content.
`font_12_cff_off00082a92.bin` `331559013bae1bed3d2b9ef4a93ff99963b516e528574f4c371a798d67a715cc`	pdf-font-stream	PDF embedded font (cff) at offset 0x82A92	4406 bytes
`font_13_cff_off0008398a.bin` `588a76db61e4e267ee8494840bef04e170a79ab4a688563a08a03608d15294ba`	pdf-font-stream	PDF embedded font (cff) at offset 0x8398A	2935 bytes
`font_14_cff_off0008440b.bin` `b38a8d799134f8c45e5c24f42fbd86cdd1230a86b6d9e06e42bfb97e2bc445ef`	pdf-font-stream	PDF embedded font (cff) at offset 0x8440B	2398 bytes
`font_15_cff_off00084dd5.bin` `a3030d0f8714b4bddccc5833bbf4b088240201959563acc822f3e56c6ccc5dfd`	pdf-font-stream	PDF embedded font (cff) at offset 0x84DD5	1041 bytes
`font_16_cff_off00085229.bin` `c67313452626498cd4d0733b4523b9ecb70a75e0a5c5c686858f095bd5ae119c`	pdf-font-stream	PDF embedded font (cff) at offset 0x85229	257 bytes
`font_17_cff_off00085365.bin` `06970a84f1da06d8f2a248cea2824b8078e11e77d6e0b119de5bbfbf49a69ac7`	pdf-font-stream	PDF embedded font (cff) at offset 0x85365	1446 bytes
`polyglot_child_pdf_off00030ed0.pdf` `ea39084b3fdf994b1f6966c8360a02af781c1fe80990fa8351701ac6ac9f0b90`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x30ED0	567761 bytes

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